Command History gets really slow when >1000 items

[mofojed]

Description

When there are lots of items in the command history (more than 1000) it gets really slow when scrolling

Steps to reproduce

1. Add >1000 items to command history
2. Scroll up and down quickly

Expected results
2. Able to see command history quickly

Actual results
2. Shows a blank screen when scrolling, takes a few seconds for the information to appear