I'm using Firefox on Windows 10. Loads in about 1.5s for me. Obviously it'll depend on PC and internet connection. I would try it with addons disabled though.

I'm using Firefox on Windows 10. Loads in about 1.5s for me. Obviously it'll depend on PC and internet connection. I would try it with addons disabled though. (Restart with addons disabled / in safe mode in the help menu.) In the past I've found misbehaved addons (particularly the god-awful skype one that used to always force install itself) would bring gmail to a crawl.