files - make exists as fast as possible with our current file system …

…provider API

src/vs/platform/files/common/fileService.ts

@@ -253,8 +253,12 @@ export class FileService extends Disposable implements IFileService {
 	}
 
 	async exists(resource: URI): Promise<boolean> {
+		const provider = await this.withProvider(resource);
+
 		try {
-			return !!(await this.resolve(resource));
+			const stat = await provider.stat(resource);
+
+			return !!stat;
 		} catch (error) {
 			return false;
 		}