limit avatar loads to 50 at a time (#10106)
limit avatar loads to 50 at a time (#10106)

* limit avatar loads to 50 at a time

* need to update value after switch to immutable

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client