How to debug whats happening when it looks like nothing is happening

[psweb]

Its all on my own server, console has quite a few messages

14 Warnings about js.map files missing

1 Error I am trying to figure out Bootstrap doesn't allow more than one instance per element. Bound instance: bs.tooltip.

52 AppConnect messages all saying [Violation] 'message' handler took 166ms polyfills.js:3

Maybe I need @Dave's Mantis debugger tool

Edit: I think its the same issue as mentioned here

Polyfills not an error but eat up precious time

I am trying to speed up the screen display of many of my pages. I know this subject has been mentioned before but I feel that polyfills, although not an error, do eat up precious time. Please correct me if I am wrong because this is not an area I know much about. My thoughts, based on the screenshot below, are that these polyfills are little snippets of code required for backwards compatibility with IE (again I may be wrong). Because I use Chrome and my client only uses Chrome (they have agreed…