I have a peculiar problem with Firefox.
I created the following application: https://github.com/CecilWesterhof/PublishedPhotos
Often in Firefox there are six seconds between fetches for the same page.
I wrote the testFetch.py to make sure the problem is not with the server.
After this I tried it in Chrome. There I do not have this problem.
What could be happening here.
By the way: I did try safe-mode. It seems to happen lesse often, but it still happens.