Now that the algorithm is better, I should say so in the readme.
Reserved a line for the replication response text.
Changed 'replicate' to display a crude status line.
Disabled and re-enabled 'replicate' after completion.
Disabled filter form inputs while requests are pending.

This is probably the worst kind of feedback to ever give to the user. At least
I excluded the element which has the focus because it gets lost in Chrome
otherwise. Still very very bad interface.