incremental text documents cause perf isssues

extensions/css-language-features/server/src/cssServerMain.ts

@@ -33,7 +33,7 @@ process.on('unhandledRejection', (e: any) => {
 });
 
 // Create a text document manager.
-const documents: TextDocuments = new TextDocuments(TextDocumentSyncKind.Incremental);
+const documents: TextDocuments = new TextDocuments();
 // Make the text document manager listen on the connection
 // for open, change and close text document events
 documents.listen(connection);