tab completion is sluggish

[email . lists81]

Hi!

Doing tab completion in my user account is quite sluggish, it takes 
about half a second before anything happens after pressing tab.

I've done an strace on the shell and it turns out that when I press tab 
bash does a select() on stdout that times out after half a second. When 
I'm logged in as root and do the same thing bash does not do that, so I 
presume it has something to do with how tab completion is configured 
when I'm logged in to my regular user account. I'm not sure how to 
investigate this further, any help would be appreciated. I'm still on 
debian 10 and my version of bash is 5.0.3(1)

regards
A