added commented debug logs

lib/single-file/single-file-core.js

@@ -178,9 +178,18 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 		}
 
 		async executeStage(step) {
-			STAGES[step].sync.forEach(task => this.executeTask(task, !step));
+			STAGES[step].sync.forEach(task => {
+				// const startTime = Date.now();
+				this.executeTask(task, !step);
+				// console.log(task.action, Date.now() - startTime);
+			});
 			if (STAGES[step].async) {
-				return Promise.all(STAGES[step].async.map(task => this.executeTask(task, !step)));
+				return Promise.all(STAGES[step].async.map(task => {
+					// const startTime = Date.now();
+					const promise = this.executeTask(task, !step);
+					// promise.then(() => console.log(task.action, Date.now() - startTime));
+					return promise;
+				}));
 			}
 		}