Very slow "Logs" with Google Apps Script V8 vs Rhino?

Question

With Rhino, Logs dialog ("command + Enter" or Logs from View menu) shows logs instantly. However, with test projects using V8 engine it takes 10-20 seconds to load even the simplest logs, with a message "Waiting for logs, please wait..."

Both, "Logger.log" or "console.log" are slow to load logs. Is anyone else experiencing the same type of slowness? Is this expected with the new engine?

Here's a basic function I used for testing:

function logTest() {
 Logger.log("log test");
}

Answer 1

I noticed the same thing and there is an issue about it already.

I've been using the below script. It's probably not bullet proof but for me it's better than waiting for the log. I also notice that if you have an error and go to View Executions that the logs appear to come out there now even before we get them on the script editor.

Issue Link: https://issuetracker.google.com/issues/149519063

function MyLogger(s,t=5) {
  const cs=CacheService.getScriptCache();
  const cached=cs.get("Logger");
  const ts=Utilities.formatDate(new Date(), SpreadsheetApp.getActive().getSpreadsheetTimeZone(), "yy/MM/dd HH:mm:ss")
  if(cached) {
    var v=Utilities.formatString('%s<br />[%s] - %s',cached,ts,s);   
  }else{
    var v=Utilities.formatString('[%s] - %s',ts,s);
  }
  cs.put("Logger",v,t);
  SpreadsheetApp.getUi().showModelessDialog(HtmlService.createHtmlOutput(v), 'My Logger');
}

Another version of MyLogger():

function MyLogger(s,d=true,w=800,h=400,t=5) {
  const cs=CacheService.getScriptCache();
  const cached=cs.get("Logger");
  const ts=Utilities.formatDate(new Date(), SpreadsheetApp.getActive().getSpreadsheetTimeZone(), "MM|dd|HH:mm:ss")
  if(cached) {
    var v=Utilities.formatString('%s<br />[%s] - %s',cached,ts,s);   
  }else{
    var v=Utilities.formatString('[%s] - %s',ts,s);
  }
  cs.put("Logger",v,t);
  //allows logging without displaying.
  if(d) {
    const a='<br /><input type="button" value="Exit" onClick="google.script.host.close();" />';
    const b='<br /><input type="button" value="Exit" onClick="google.script.host.close();" /><br />';
    SpreadsheetApp.getUi().showModelessDialog(HtmlService.createHtmlOutput(b+v+a).setWidth(w).setHeight(h), 'My Logger');
  }
}