[tambourine_man]

I don’t use it either but I think you can change the delay. Check out :h 'ttimeout' and :h 'ttimeoutlen'

Haven’t touched that part of my vimrc in years

[alpaca128]

Changing the delay will not completely get rid of this phenomenon but will definitely make a ton of my other shortcuts harder to use. That visual delay makes a lot of sense, it's just not a feature that was intended with this specific use in mind and so it seems to behave strange for jj/jk/etc shortcuts.