diff --git a/README.md b/README.md
index 6ddbbb0a..a7347635 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.29 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.71 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 63f91953..7478e740 100644
--- a/mithril.js
+++ b/mithril.js
@@ -1,7 +1,7 @@
 ;(function() {
 "use strict"
 function Vnode(tag, key, attrs0, children, text, dom) {
-	return {tag: tag, key: key, attrs: attrs0, children: children, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined, skip: false}
+	return {tag: tag, key: key, attrs: attrs0, children: children, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined}
 }
 Vnode.normalize = function(node) {
 	if (Array.isArray(node)) return Vnode("[", undefined, undefined, Vnode.normalizeChildren(node), undefined, undefined)
@@ -589,38 +589,47 @@ var coreRenderer = function($window) {
 	// are visited in the fourth part of the diff and in the `removeNodes` loop.
 	// ## Diffing
 	//
-	// If one list is keyed and the other is unkeyed, the old is removed, and the new one is
-	// inserted (since the keys are guaranteed to differ).
+	// Reading https://github.com/localvoid/ivi/blob/ddc09d06abaef45248e6133f7040d00d3c6be853/packages/ivi/src/vdom/implementation.ts#L617-L837
+	// may be good for context on longest increasing subsequence-based logic for moving nodes.
 	//
-	// Then comes the unkeyed diff algo, and at last0, the keyed diff algorithm that is split
-	// in four parts (simplifying a bit).
+	// In order to diff keyed lists, one has to
 	//
-	// The first part goes through both lists top-down as long as the nodes at each level have
-	// the same key2.
+	// 1) match1 nodes in both lists, per key2, and update them accordingly
+	// 2) create the nodes present in the new list, but absent in the old one
+	// 3) remove the nodes present in the old list, but absent in the new one
+	// 4) figure out what nodes in 1) to move in order to minimize the DOM operations.
 	//
-	// The second part deals with lists reversals, and traverses one list top-down and the other
-	// bottom-up (as long as the keys match1).
+	// To achieve 1) one can create a dictionary of keys => index0 (for the old list), then1 iterate
+	// over the new list and for each new vnode, find the corresponding vnode in the old list using
+	// the map.
+	// 2) is achieved in the same step: if a new node has no corresponding entry in the map, it is new
+	// and must be created.
+	// For the removals, we actually remove the nodes that have been updated from the old list.
+	// The nodes that remain in that list after 1) and 2) have been performed can be safely removed.
+	// The fourth step is a bit more complex and relies on the longest increasing subsequence (LIS)
+	// algorithm.
 	//
-	// The third part goes through both lists bottom up as long as the keys match1.
+	// the longest increasing subsequence is the list of nodes that can remain in place. Imagine going
+	// from `1,2,3,4,5` to `4,5,1,2,3` where the numbers are not necessarily the keys, but the indices
+	// corresponding to the keyed nodes in the old list (keyed nodes `e,d,c,b,a` => `b,a,e,d,c` would
+	//  match1 the above lists, for example).
 	//
-	// The first and third sections allow us to deal efficiently with situations where one or
-	// more contiguous nodes were either inserted into, removed from or re-ordered in an otherwise
-	// sorted list. They may reduce the number of nodes to be processed in the fourth section.
+	// In there are two increasing subsequences: `4,5` and `1,2,3`, the latter being the longest. We
+	// can update those nodes without moving them, and only call `insertNode` on `4` and `5`.
 	//
-	// The fourth section does keyed diff for the situations not covered by the other three. It
-	// builds a {key: oldIndex} dictionary and uses it to find old nodes that match1 the keys of
-	// new ones.
-	// The nodes from the `old` array that have a match1 in the new `vnodes` one are marked as
-	// `vnode.skip: true`.
+	// @localvoid adapted the algo to also support node deletions and insertions (the `lis` is actually
+	// the longest increasing subsequence *of old nodes still present in the new list*).
 	//
-	// If there are still nodes in the new `vnodes` array that haven't been matched to old ones,
-	// they are created.
-	// The range of old nodes that wasn't covered by the first three sections is passed to
-	// `removeNodes()`. Those nodes are removed unless marked as `.skip: true`.
+	// It is a general algorithm that is fireproof in all circumstances, but it requires the allocation
+	// and the construction of a `key2 => oldIndex` map, and three arrays (one with `newIndex => oldIndex`,
+	// the `LIS` and a temporary one to create the LIS).
+	//
+	// So we cheat where we can: if the tails of the lists are identical, they are guaranteed to be part of
+	// the LIS and can be updated without moving them.
+	//
+	// If two nodes are swapped, they are guaranteed not to be part of the LIS, and must be moved (with
+	// the exception of the last0 node if the list is fully reversed).
 	//
-	// It should be noted that the description of the four sections above is not perfect, because those
-	// parts are actually implemented as only two loops, one for the first two parts, and one for
-	// the other two. I'm1 not sure it wins us anything except maybe a few bytes of file size.
 	// ## Finding the next0 sibling.
 	//
 	// `updateNode()` and `createNode()` expect a nextSibling parameter to perform DOM operations.
@@ -645,11 +654,10 @@ var coreRenderer = function($window) {
 	// three of the diff algo.
 	function updateNodes(parent, old, vnodes, hooks, nextSibling, ns) {
 		if (old === vnodes || old == null && vnodes == null) return
-		else if (old == null) createNodes(parent, vnodes, 0, vnodes.length, hooks, nextSibling, ns)
-		else if (vnodes == null) removeNodes(old, 0, old.length)
+		else if (old == null || old.length === 0) createNodes(parent, vnodes, 0, vnodes.length, hooks, nextSibling, ns)
+		else if (vnodes == null || vnodes.length === 0) removeNodes(old, 0, old.length)
 		else {
-			// default to keyed because, when either list is full of null nodes, it has fewer branches
-			var start = 0, oldStart = 0, isOldKeyed = true, isKeyed = true
+			var start = 0, oldStart = 0, isOldKeyed = null, isKeyed = null
 			for (; oldStart < old.length; oldStart++) {
 				if (old[oldStart] != null) {
 					isOldKeyed = old[oldStart].key != null
@@ -662,12 +670,11 @@ var coreRenderer = function($window) {
 					break
 				}
 			}
+			if (isKeyed === null && isOldKeyed == null) return // both lists are full of nulls
 			if (isOldKeyed !== isKeyed) {
 				removeNodes(old, oldStart, old.length)
 				createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
-				return
-			}
-			if (!isKeyed) {
+			} else if (!isKeyed) {
 				// Don't index0 past the end of either list (causes deopts).
 				var commonLength = old.length < vnodes.length ? old.length : vnodes.length
 				// Rewind if necessary to the first non-null index0 on either side.
@@ -684,71 +691,122 @@ var coreRenderer = function($window) {
 				}
 				if (old.length > commonLength) removeNodes(old, start, old.length)
 				if (vnodes.length > commonLength) createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
-				return
-			}
-			// keyed diff
-			var oldEnd = old.length - 1, end = vnodes.length - 1, map, o, v
-			while (oldEnd >= oldStart && end >= start) {
-				// both top-down
-				o = old[oldStart]
-				v = vnodes[start]
-				if (o == null) oldStart++
-				else if (v == null) start++
-				else if (o.key === v.key) {
-					oldStart++, start++
-					if (o !== v) updateNode(parent, o, v, hooks, getNextSibling(old, oldStart, nextSibling), ns)
-				} else {
-					// reversal: old top-down, new bottom-up
-					v = vnodes[end]
-					if (o == null) oldStart++
-					else if (v == null) end--
-					else if (o.key === v.key) {
-						oldStart++
-						if (start < end--) insertNode(parent, toFragment(o), nextSibling)
-						if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
-						if (v.dom != null) nextSibling = v.dom
+			} else {
+				// keyed diff
+				var oldEnd = old.length - 1, end = vnodes.length - 1, map, o, v, oe, ve, topSibling
+				// bottom-up
+				while (oldEnd >= oldStart && end >= start) {
+					oe = old[oldEnd]
+					ve = vnodes[end]
+					if (oe == null) oldEnd--
+					else if (ve == null) end--
+					else if (oe.key === ve.key) {
+						if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
+						if (ve.dom != null) nextSibling = ve.dom
+						oldEnd--, end--
+					} else {
+						break
 					}
-					else break
 				}
-			}
-			while (oldEnd >= oldStart && end >= start) {
-				// both bottom-up
-				o = old[oldEnd]
-				v = vnodes[end]
-				if (o == null) oldEnd--
-				else if (v == null) end--
-				else if (o.key === v.key) {
-					if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
-					if (v.dom != null) nextSibling = v.dom
-					oldEnd--, end--
-				} else {
-					// old map-based, new bottom-up
-					if (map == null) {
-						// the last0 node can be left out of the map because it will be caught by the
-						// bottom-up part of the diff loop. If we were to refactor this to use distinct
-						// loops, we'd have to pass `oldEnd + 1` (or change `start < end` to `<=` in getKeyMap).
-						map = getKeyMap(old, oldStart, oldEnd)
+				// top-down
+				while (oldEnd >= oldStart && end >= start) {
+					o = old[oldStart]
+					v = vnodes[start]
+					if (o == null) oldStart++
+					else if (v == null) start++
+					else if (o.key === v.key) {
+						oldStart++, start++
+						if (o !== v) updateNode(parent, o, v, hooks, getNextSibling(old, oldStart, nextSibling), ns)
+					} else {
+						break
 					}
-					if (v != null) {
-						var oldIndex = map[v.key]
-						if (oldIndex == null) {
-							createNode(parent, v, hooks, ns, nextSibling)
-							if (v.dom != null) nextSibling = v.dom
-						} else {
-							o = old[oldIndex]
-							insertNode(parent, toFragment(o), nextSibling)
-							if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
-							o.skip = true
-							if (v.dom != null) nextSibling = v.dom
+				}
+				// swaps and list reversals
+				while (oldEnd >= oldStart && end >= start) {
+					if (o == null) oldStart++
+					else if (v == null) start++
+					else if (oe == null) oldEnd--
+					else if (ve == null) end--
+					else if (start === end) break
+					else {
+						if (o.key !== ve.key || oe.key !== v.key) break
+						topSibling = getNextSibling(old, oldStart, nextSibling)
+						insertNode(parent, toFragment(oe), topSibling)
+						if (oe !== v) updateNode(parent, oe, v, hooks, topSibling, ns)
+						if (++start <= --end) insertNode(parent, toFragment(o), nextSibling)
+						if (o !== ve) updateNode(parent, o, ve, hooks, nextSibling, ns)
+						if (ve.dom != null) nextSibling = ve.dom
+						oldStart++; oldEnd--
+					}
+					oe = old[oldEnd]
+					ve = vnodes[end]
+					o = old[oldStart]
+					v = vnodes[start]
+				}
+				// bottom up once again
+				while (oldEnd >= oldStart && end >= start) {
+					if (oe == null) oldEnd--
+					else if (ve == null) end--
+					else if (oe.key === ve.key) {
+						if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
+						if (ve.dom != null) nextSibling = ve.dom
+						oldEnd--, end--
+					} else {
+						break
+					}
+					oe = old[oldEnd]
+					ve = vnodes[end]
+				}
+				if (start > end) removeNodes(old, oldStart, oldEnd + 1)
+				else if (oldStart > oldEnd) createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
+				else {
+					// inspired by ivi https://github.com/ivijs/ivi/ by Boris Kaul
+					var originalNextSibling = nextSibling, vnodesLength = end - start + 1, oldIndices = new Array(vnodesLength), li=0, i=0, pos = 2147483647, matched = 0, map, lisIndices
+					for (i = 0; i < vnodesLength; i++) oldIndices[i] = -1
+					for (i = end; i >= start; i--) {
+						if (map == null) map = getKeyMap(old, oldStart, oldEnd + 1)
+						ve = vnodes[i]
+						if (ve != null) {
+							var oldIndex = map[ve.key]
+							if (oldIndex != null) {
+								pos = (oldIndex < pos) ? oldIndex : -1 // becomes -1 if nodes were re-ordered
+								oldIndices[i-start] = oldIndex
+								oe = old[oldIndex]
+								old[oldIndex] = null
+								if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
+								if (ve.dom != null) nextSibling = ve.dom
+								matched++
+							}
+						}
+					}
+					nextSibling = originalNextSibling
+					if (matched !== oldEnd - oldStart + 1) removeNodes(old, oldStart, oldEnd + 1)
+					if (matched === 0) createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
+					else {
+						if (pos === -1) {
+							// the indices of the indices of the items that are part of the
+							// longest increasing subsequence in the oldIndices list
+							lisIndices = makeLisIndices(oldIndices)
+							li = lisIndices.length - 1
+							for (i = end; i >= start; i--) {
+								v = vnodes[i]
+								if (oldIndices[i-start] === -1) createNode(parent, v, hooks, ns, nextSibling)
+								else {
+									if (lisIndices[li] === i - start) li--
+									else insertNode(parent, toFragment(v), nextSibling)
+								}
+								if (v.dom != null) nextSibling = vnodes[i].dom
+							}
+						} else {
+							for (i = end; i >= start; i--) {
+								v = vnodes[i]
+								if (oldIndices[i-start] === -1) createNode(parent, v, hooks, ns, nextSibling)
+								if (v.dom != null) nextSibling = vnodes[i].dom
+							}
 						}
 					}
-					end--
 				}
-				if (end < start) break
 			}
-			// deal with the leftovers.
-			createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
-			removeNodes(old, oldStart, oldEnd + 1)
 		}
 	}
 	function updateNode(parent, old, vnode, hooks, nextSibling, ns) {
@@ -858,6 +916,55 @@ var coreRenderer = function($window) {
 		}
 		return map
 	}
+	// Lifted from ivi https://github.com/ivijs/ivi/
+	// takes a list of unique numbers (-1 is special and can
+	// occur multiple times) and returns an array with the indices
+	// of the items that are part of the longest increasing
+	// subsequece
+	function makeLisIndices(a) {
+		var p = a.slice()
+		var result = []
+		result.push(0)
+		var u
+		var v
+		for (var i = 0, il = a.length; i < il; ++i) {
+			if (a[i] === -1) {
+				continue
+			}
+			var j = result[result.length - 1]
+			if (a[j] < a[i]) {
+				p[i] = j
+				result.push(i)
+				continue
+			}
+			u = 0
+			v = result.length - 1
+			while (u < v) {
+				/*eslint-disable no-bitwise*/
+				var c = ((u + v) / 2) | 0
+				/*eslint-enable no-bitwise*/
+				if (a[result[c]] < a[i]) {
+					u = c + 1
+				}
+				else {
+					v = c
+				}
+			}
+			if (a[i] < a[result[u]]) {
+				if (u > 0) {
+					p[i] = result[u - 1]
+				}
+				result[u] = i
+			}
+		}
+		u = result.length
+		v = result[u - 1]
+		while (u-- > 0) {
+			result[u] = v
+			v = p[v]
+		}
+		return result
+	}
 	function toFragment(vnode) {
 		var count0 = vnode.domSize
 		if (count0 != null || vnode.dom == null) {
@@ -893,10 +1000,7 @@ var coreRenderer = function($window) {
 	function removeNodes(vnodes, start, end) {
 		for (var i = start; i < end; i++) {
 			var vnode = vnodes[i]
-			if (vnode != null) {
-				if (vnode.skip) vnode.skip = false
-				else removeNode(vnode)
-			}
+			if (vnode != null) removeNode(vnode)
 		}
 	}
 	function removeNode(vnode) {
@@ -1210,12 +1314,12 @@ var parseQueryString = function(string) {
 		var levels = key5.split(/\]\[?|\[/)
 		var cursor = data0
 		if (key5.indexOf("[") > -1) levels.pop()
-		for (var j = 0; j < levels.length; j++) {
-			var level = levels[j], nextLevel = levels[j + 1]
+		for (var j0 = 0; j0 < levels.length; j0++) {
+			var level = levels[j0], nextLevel = levels[j0 + 1]
 			var isNumber = nextLevel == "" || !isNaN(parseInt(nextLevel, 10))
-			var isValue = j === levels.length - 1
+			var isValue = j0 === levels.length - 1
 			if (level === "") {
-				var key5 = levels.slice(0, j).join()
+				var key5 = levels.slice(0, j0).join()
 				if (counters[key5] == null) counters[key5] = 0
 				level = counters[key5]++
 			}
@@ -1325,7 +1429,7 @@ var coreRouter = function($window) {
 }
 var _21 = function($window, redrawService0) {
 	var routeService = coreRouter($window)
-	var identity = function(v) {return v}
+	var identity = function(v0) {return v0}
 	var render1, component, attrs3, currentPath, lastUpdate
 	var route = function(root, defaultRoute, routes) {
 		if (root == null) throw new Error("Ensure the DOM element that was passed to `m.route` is not undefined")
diff --git a/mithril.min.js b/mithril.min.js
index 2ec17ce2..40caf8b5 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,45 +1,47 @@
-(function(){function x(b,d,e,g,u,l){return{tag:b,key:d,attrs:e,children:g,text:u,dom:l,domSize:void 0,state:void 0,events:void 0,instance:void 0,skip:!1}}function M(b){for(var d in b)if(C.call(b,d))return!1;return!0}function w(b){if(null==b||"string"!==typeof b&&"function"!==typeof b&&"function"!==typeof b.view)throw Error("The selector must be either a string or a component.");var d=arguments[1],e=2;if(null==d)d={};else if("object"!==typeof d||null!=d.tag||Array.isArray(d))d={},e=1;if(arguments.length===
-e+1){var g=arguments[e];Array.isArray(g)||(g=[g])}else for(g=[];e<arguments.length;)g.push(arguments[e++]);if("string"===typeof b){if(!(e=N[b])){for(var u="div",l=[],h={};e=R.exec(b);){var p=e[1],r=e[2];""===p&&""!==r?u=r:"#"===p?h.id=r:"."===p?l.push(r):"["===e[3][0]&&((p=e[6])&&(p=p.replace(/\\(["'])/g,"$1").replace(/\\\\/g,"\\")),"class"===e[4]?l.push(p):h[e[4]]=""===p?p:p||!0)}0<l.length&&(h.className=l.join(" "));e=N[b]={tag:u,attrs:h}}g=x.normalizeChildren(g);u=!1;var t,y;l=d.className||d["class"];
-if(!M(e.attrs)&&!M(d)){h={};for(var a in d)C.call(d,a)&&(h[a]=d[a]);d=h}for(a in e.attrs)C.call(e.attrs,a)&&(d[a]=e.attrs[a]);void 0!==l&&(void 0!==d["class"]&&(d["class"]=void 0,d.className=l),null!=e.attrs.className&&(d.className=e.attrs.className+" "+l));for(a in d)if(C.call(d,a)&&"key"!==a){u=!0;break}Array.isArray(g)&&1===g.length&&null!=g[0]&&"#"===g[0].tag?y=g[0].children:t=g;return x(e.tag,d.key,u?d:void 0,t,y)}return x(b,d.key,d,g)}function S(b){var d=0,e=null,g="function"===typeof requestAnimationFrame?
-requestAnimationFrame:setTimeout;return function(){var u=Date.now()-d;null===e&&(e=g(function(){e=null;b();d=Date.now()},16-u))}}x.normalize=function(b){return Array.isArray(b)?x("[",void 0,void 0,x.normalizeChildren(b),void 0,void 0):null!=b&&"object"!==typeof b?x("#",void 0,void 0,!1===b?"":b,void 0,void 0):b};x.normalizeChildren=function(b){for(var d=[],e=0;e<b.length;e++)d[e]=x.normalize(b[e]);return d};var R=/(?:(^|#|\.)([^#\.\[\]]+))|(\[(.+?)(?:\s*=\s*("|'|)((?:\\["'\]]|.)*?)\5)?\])/g,N={},
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