I use 1Password on Windows 10 (and iOS) and "hanging for minutes at a time" has definitely not been my experience anywhere. It works well enough for daily use. The Chrome integration sometimes does stop working (about once a fortnight or so) but Help > Restart 1Password Helper takes care of that.

Yes the UI is "classic Windows" not "modern UI"[1] but written an afterthought seems a bit harsh.

[1] https://i.agilebits.com/db/2014-04-02_14-11-43.png