Browser Performance

I just installed 1.90 and am seeing a dramatic site load time difference between Edge, the fastest , and Firefox, the slowest. Chrome is somewhere in the middle. The rendering itself appears to be about the same. Is this to be expected?

It was suggested that I add examples.

Again the order of Browser load time performance is:

Edge - Best
Chrome - Acceptable
Firefox - Often very poor

Two site examples would be:

https://vcities.umsl.edu/St.Louis/SJF.html
and
https://vcities.umsl.edu/St.Louis/HarlemCreek.html

A third example that should be as bad but does not seem to be is:

https://vcities.umsl.edu/St.Louis/riverfrontF.html