timeoutlen = 100ms

[w-r-z-k]

Setting timeoutlen to 100 milliseconds in the options file makes it appears like the leader key is not working.

[ghost]

This is issue was mentioned in vim-which-key repo here

You can find solution here
https://vi.stackexchange.com/questions/3964/timeoutlen-breaks-leader-and-vim-commentary

[tvdab]

I experienced a similar problem with the vim fugitive plugin when timeoutlen was set to 100 milliseconds. The fugitive dd mapping to show a diff view did not work. Instead nvim interpreted this as a regular dd (delete line). Solved by setting timeoutlen to 300 milliseconds. Downside is that whichkey now takes longer to show up, but this is probably inevitable.

[eclectic-coding]

That is interesting... In all branches before 21-whichkey the timeoutlen to 1000 milliseconds and Leader works fine. There is probably a setting between 100-1000 that may work better.

[CharlesChiuGit]

I hope I saw this post sooner. I spent two days on debugging this...