Very slow searches

Searching takes 1-2 minutes - it is very slow. I’m not sure why - all the messages are being downloaded. I used the Thunderbird email client before and searches were fast - so it is something to do with my recent move to the eM mail client. If I can’t get it fixed, I will have to go back to Thunderbird - as it is just taking crazy long to do any searches. Thank you for any tips/help or things to try.

What happens if you disable conversations (Menu > View > Conversations)?