diff --git a/src/vs/editor/common/config/commonEditorConfig.ts b/src/vs/editor/common/config/commonEditorConfig.ts
index b1938677456..3c463fe6c46 100644
--- a/src/vs/editor/common/config/commonEditorConfig.ts
+++ b/src/vs/editor/common/config/commonEditorConfig.ts
@@ -668,6 +668,16 @@ const editorConfiguration: IConfigurationNode = {
 			'default': true,
 			'description': nls.localize('ignoreTrimWhitespace', "Controls if the diff editor shows changes in leading or trailing whitespace as diffs")
 		},
+		'editor.largeFileSize': {
+			'type': 'number',
+			'default': EDITOR_MODEL_DEFAULTS.largeFileSize,
+			'description': nls.localize('largeFileSize', "Controls file size threshold in bytes beyond which special optimization rules are applied")
+		},
+		'editor.largeFileLineCount': {
+			'type': 'number',
+			'default': EDITOR_MODEL_DEFAULTS.largeFileLineCount,
+			'description': nls.localize('largeFileLineCount', "Controls file size threshold in terms of line count beyond which special optimization rules are applied")
+		},
 		'diffEditor.renderIndicators': {
 			'type': 'boolean',
 			'default': true,
diff --git a/src/vs/editor/common/config/editorOptions.ts b/src/vs/editor/common/config/editorOptions.ts
index ebbd7a52cb2..48d76961005 100644
--- a/src/vs/editor/common/config/editorOptions.ts
+++ b/src/vs/editor/common/config/editorOptions.ts
@@ -2204,7 +2204,9 @@ export const EDITOR_MODEL_DEFAULTS = {
 	tabSize: 4,
 	insertSpaces: true,
 	detectIndentation: true,
-	trimAutoWhitespace: true
+	trimAutoWhitespace: true,
+	largeFileSize: 20 * 1024 * 1024, // 20 MB
+	largeFileLineCount: 300 * 1000 // 300K lines
 };
 
 /**
diff --git a/src/vs/editor/common/model.ts b/src/vs/editor/common/model.ts
index ff909869d8e..b8c7a186cae 100644
--- a/src/vs/editor/common/model.ts
+++ b/src/vs/editor/common/model.ts
@@ -396,6 +396,8 @@ export interface ITextModelCreationOptions {
 	trimAutoWhitespace: boolean;
 	defaultEOL: DefaultEndOfLine;
 	isForSimpleWidget: boolean;
+	largeFileSize: number;
+	largeFileLineCount: number;
 }
 
 export interface ITextModelUpdateOptions {
diff --git a/src/vs/editor/common/model/textModel.ts b/src/vs/editor/common/model/textModel.ts
index 3975b563698..53d6bc2df0e 100644
--- a/src/vs/editor/common/model/textModel.ts
+++ b/src/vs/editor/common/model/textModel.ts
@@ -155,8 +155,6 @@ class TextModelSnapshot implements ITextSnapshot {
 export class TextModel extends Disposable implements model.ITextModel {
 
 	private static readonly MODEL_SYNC_LIMIT = 50 * 1024 * 1024; // 50 MB
-	private static readonly MODEL_TOKENIZATION_LIMIT = 20 * 1024 * 1024; // 20 MB
-	private static readonly MANY_MANY_LINES = 300 * 1000; // 300K lines
 
 	public static DEFAULT_CREATION_OPTIONS: model.ITextModelCreationOptions = {
 		isForSimpleWidget: false,
@@ -165,6 +163,8 @@ export class TextModel extends Disposable implements model.ITextModel {
 		detectIndentation: false,
 		defaultEOL: model.DefaultEndOfLine.LF,
 		trimAutoWhitespace: EDITOR_MODEL_DEFAULTS.trimAutoWhitespace,
+		largeFileSize: EDITOR_MODEL_DEFAULTS.largeFileSize,
+		largeFileLineCount: EDITOR_MODEL_DEFAULTS.largeFileLineCount,
 	};
 
 	public static createFromString(text: string, options: model.ITextModelCreationOptions = TextModel.DEFAULT_CREATION_OPTIONS, languageIdentifier: LanguageIdentifier = null, uri: URI = null): TextModel {
@@ -289,8 +289,8 @@ export class TextModel extends Disposable implements model.ITextModel {
 		// If a model is too large at construction time, it will never get tokenized,
 		// under no circumstances.
 		this._isTooLargeForTokenization = (
-			(bufferTextLength > TextModel.MODEL_TOKENIZATION_LIMIT)
-			|| (bufferLineCount > TextModel.MANY_MANY_LINES)
+			(bufferTextLength > creationOptions.largeFileSize)
+			|| (bufferLineCount > creationOptions.largeFileLineCount)
 		);
 
 		this._shouldSimplifyMode = (
diff --git a/src/vs/editor/common/services/modelServiceImpl.ts b/src/vs/editor/common/services/modelServiceImpl.ts
index fa395f924f0..b189ac8390c 100644
--- a/src/vs/editor/common/services/modelServiceImpl.ts
+++ b/src/vs/editor/common/services/modelServiceImpl.ts
@@ -197,6 +197,8 @@ interface IRawConfig {
 		insertSpaces?: any;
 		detectIndentation?: any;
 		trimAutoWhitespace?: any;
+		largeFileSize?: any;
+		largeFileLineCount?: any;
 	};
 }
 
@@ -275,13 +277,31 @@ export class ModelServiceImpl implements IModelService {
 			detectIndentation = (config.editor.detectIndentation === 'false' ? false : Boolean(config.editor.detectIndentation));
 		}
 
+		let largeFileSize = EDITOR_MODEL_DEFAULTS.largeFileSize;
+		if (config.editor && typeof config.editor.largeFileSize !== 'undefined') {
+			let parsedlargeFileSize = parseInt(config.editor.largeFileSize, 10);
+			if (!isNaN(parsedlargeFileSize)) {
+				largeFileSize = parsedlargeFileSize;
+			}
+		}
+
+		let largeFileLineCount = EDITOR_MODEL_DEFAULTS.largeFileLineCount;
+		if (config.editor && typeof config.editor.largeFileLineCount !== 'undefined') {
+			let parsedlargeFileLineCount = parseInt(config.editor.largeFileLineCount, 10);
+			if (!isNaN(parsedlargeFileLineCount)) {
+				largeFileLineCount = parsedlargeFileLineCount;
+			}
+		}
+
 		return {
 			isForSimpleWidget: isForSimpleWidget,
 			tabSize: tabSize,
 			insertSpaces: insertSpaces,
 			detectIndentation: detectIndentation,
 			defaultEOL: newDefaultEOL,
-			trimAutoWhitespace: trimAutoWhitespace
+			trimAutoWhitespace: trimAutoWhitespace,
+			largeFileSize: largeFileSize,
+			largeFileLineCount: largeFileLineCount
 		};
 	}
 
diff --git a/src/vs/editor/test/common/editorTestUtils.ts b/src/vs/editor/test/common/editorTestUtils.ts
index 9c7ed1e9826..d2e8cb2072e 100644
--- a/src/vs/editor/test/common/editorTestUtils.ts
+++ b/src/vs/editor/test/common/editorTestUtils.ts
@@ -22,6 +22,8 @@ export interface IRelaxedTextModelCreationOptions {
 	trimAutoWhitespace?: boolean;
 	defaultEOL?: DefaultEndOfLine;
 	isForSimpleWidget?: boolean;
+	largeFileSize?: number;
+	largeFileLineCount?: number;
 }
 
 export function createTextModel(text: string, _options: IRelaxedTextModelCreationOptions = TextModel.DEFAULT_CREATION_OPTIONS, languageIdentifier: LanguageIdentifier = null, uri: URI = null): TextModel {
@@ -32,6 +34,8 @@ export function createTextModel(text: string, _options: IRelaxedTextModelCreatio
 		trimAutoWhitespace: (typeof _options.trimAutoWhitespace === 'undefined' ? TextModel.DEFAULT_CREATION_OPTIONS.trimAutoWhitespace : _options.trimAutoWhitespace),
 		defaultEOL: (typeof _options.defaultEOL === 'undefined' ? TextModel.DEFAULT_CREATION_OPTIONS.defaultEOL : _options.defaultEOL),
 		isForSimpleWidget: (typeof _options.isForSimpleWidget === 'undefined' ? TextModel.DEFAULT_CREATION_OPTIONS.isForSimpleWidget : _options.isForSimpleWidget),
+		largeFileSize: (typeof _options.largeFileSize === 'undefined' ? TextModel.DEFAULT_CREATION_OPTIONS.largeFileSize : _options.largeFileSize),
+		largeFileLineCount: (typeof _options.largeFileLineCount === 'undefined' ? TextModel.DEFAULT_CREATION_OPTIONS.largeFileLineCount : _options.largeFileLineCount),
 	};
 	return TextModel.createFromString(text, options, languageIdentifier, uri);
 }