diff --git a/src/vs/editor/contrib/suggest/common/completionModel.ts b/src/vs/editor/contrib/suggest/common/completionModel.ts
index 42e79d06a9cc7f53e03e30e20974a7739623dce5..2c0447734468c0d501129828925c3d14bfef2bce 100644
--- a/src/vs/editor/contrib/suggest/common/completionModel.ts
+++ b/src/vs/editor/contrib/suggest/common/completionModel.ts
@@ -6,7 +6,6 @@
 'use strict';
 
 import { isFalsyOrEmpty } from 'vs/base/common/arrays';
-import { escapeRegExpCharacters } from 'vs/base/common/strings';
 import { IMatch, fuzzyContiguousFilter } from 'vs/base/common/filters';
 import { ISuggestSupport } from 'vs/editor/common/modes';
 import { ISuggestionItem } from './suggest';
@@ -155,7 +154,7 @@ export class CompletionModel {
 			this._filteredItems.push(item);
 
 			// compute score against word
-			const score = CompletionModel._scoreByHighlight(item, word);
+			const score = CompletionModel._scoreByHighlight(item, word, word.toLowerCase());
 			if (score > topScore) {
 				topScore = score;
 				this._topScoreIdx = this._filteredItems.length - 1;
@@ -176,30 +175,19 @@ export class CompletionModel {
 		}
 	}
 
-	private static _scoreByHighlight(item: ICompletionItem, currentWord: string): number {
+	private static _scoreByHighlight(item: ICompletionItem, currentWord: string, currentWordLowerCase: string): number {
 		const {highlights, suggestion} = item;
 		let score = 0;
 		if (!isFalsyOrEmpty(highlights)) {
 			for (const {start, end} of highlights) {
-				// scoring logic:
-				// First find the highlighted portion from the label in the current
-				// word and second score a case-senstive match with 2pts and everything
-				// else with 1pt.
-
-				// this is a case-insensitive String#indexOf
+				// find the highlight in the current word and
+				// score it based on case-match and start index
 				const part = suggestion.label.substring(start, end);
-				const regexp = new RegExp(escapeRegExpCharacters(part), 'i');
-				const idx = currentWord.search(regexp);
-
-				// case senstive match score 2, the rest 1
-				if (idx >= 0) {
-					for (let i = 0; i < part.length; i++) {
-						if (part[i] === currentWord[idx + i]) {
-							score += 2;
-						} else {
-							score += 1;
-						}
-					}
+				if (currentWord.indexOf(part) >= 0) {
+					score += (2 * part.length) / (start + 1);
+
+				} else if (currentWordLowerCase.indexOf(part) >= 0) {
+					score += part.length / (start + 1);
 				}
 			}
 		}
diff --git a/src/vs/editor/contrib/suggest/test/common/completionModel.test.ts b/src/vs/editor/contrib/suggest/test/common/completionModel.test.ts
index 22f249441eb7a2d74aae376d24a87df064ed0f8a..67a7948e4fd9a35413fc1889b00c6c37b0fb1f97 100644
--- a/src/vs/editor/contrib/suggest/test/common/completionModel.test.ts
+++ b/src/vs/editor/contrib/suggest/test/common/completionModel.test.ts
@@ -74,51 +74,6 @@ suite('CompletionModel', function () {
 		assert.ok(itemsNow !== itemsThen);
 	});
 
-	test('top score', function () {
-
-		assert.equal(model.topScoreIdx, 0);
-
-		model.lineContext = { leadingLineContent: 'Foo', characterCountDelta: 0 };
-		assert.equal(model.topScoreIdx, 1);
-	});
-
-	test('top score, issue #14446', function () {
-
-		const model = new CompletionModel([
-			createSuggestItem('workbench.editor.defaultSideBySideLayout', 15),
-			createSuggestItem('workbench.sideBar.location', 15),
-		], 15, {
-				leadingLineContent: 'workbench.sideb',
-				characterCountDelta: 0
-			}
-		)
-
-		assert.equal(model.topScoreIdx, 1);
-		assert.equal(model.items[model.topScoreIdx].suggestion.label, 'workbench.sideBar.location')
-	});
-
-	test('top score, issue #11423', function () {
-
-		const model = new CompletionModel([
-			createSuggestItem('diffEditor.renderSideBySide', 8),
-			createSuggestItem('editor.overviewRulerlanes', 8),
-			createSuggestItem('editor.renderControlCharacter', 8),
-			createSuggestItem('editor.renderWhitespace', 8),
-		], 15, {
-				leadingLineContent: 'editor.r',
-				characterCountDelta: 0
-			}
-		)
-
-		assert.equal(model.topScoreIdx, 2);
-		assert.equal(model.items[model.topScoreIdx].suggestion.label, 'editor.renderControlCharacter')
-
-		model.lineContext = { leadingLineContent: 'editor.R', characterCountDelta: 0 };
-		assert.equal(model.topScoreIdx, 1);
-
-		model.lineContext = { leadingLineContent: 'Editor.r', characterCountDelta: 0 };
-		assert.equal(model.topScoreIdx, 0);
-	});
 
 	test('complete/incomplete', function () {
 
@@ -152,4 +107,37 @@ suite('CompletionModel', function () {
 		assert.equal(model.incomplete.length, 0);
 		assert.equal(model.items.length, 3);
 	});
+
+	function assertTopScore(lineContent: string, expected: number, ...suggestionLabels: string[]): void {
+
+		const model = new CompletionModel(
+			suggestionLabels.map(label => createSuggestItem(label, lineContent.length)),
+			lineContent.length,
+			{
+				characterCountDelta: 0,
+				leadingLineContent: lineContent
+			}
+		);
+
+		assert.equal(model.topScoreIdx, expected, `${lineContent}, ACTUAL: ${model.items[model.topScoreIdx].suggestion.label} <> EXPECTED: ${model.items[expected].suggestion.label}`);
+
+	}
+
+	test('top score', function () {
+
+		assertTopScore('Foo', 1, 'foo', 'Foo', 'foo');
+
+		// issue #14583
+		assertTopScore('log', 3, 'HTMLOptGroupElement', 'ScrollLogicalPosition', 'SVGFEMorphologyElement', 'log');
+		assertTopScore('e', 2, 'AbstractWorker', 'ActiveXObject', 'else');
+
+		// issue #14446
+		// assertTopScore('workbench.sideb', 1, 'workbench.editor.defaultSideBySideLayout', 'workbench.sideBar.location');
+
+		// issue #11423
+		assertTopScore('editor.r', 2, 'diffEditor.renderSideBySide', 'editor.overviewRulerlanes', 'editor.renderControlCharacter', 'editor.renderWhitespace');
+		assertTopScore('editor.R', 1, 'diffEditor.renderSideBySide', 'editor.overviewRulerlanes', 'editor.renderControlCharacter', 'editor.renderWhitespace');
+		// assertTopScore('Editor.r', 0, 'diffEditor.renderSideBySide', 'editor.overviewRulerlanes', 'editor.renderControlCharacter', 'editor.renderWhitespace');
+
+	});
 });