Do you have and use any search index (custom/fulltext) for your forum?
If any index is used to speed up the search, there really shouldn't be a cpu load problem (unless your forum is hosted on a host that oversells a lot). I don't think this mod consumes noticeably more resources than official smf search does.
NOTE: So far this mod is *proven* to work on English, French, Spanish, German language forums.
Also I'm confident to say that there *should not* be any problem for it to work as expected on: Albanian, Brazilian, Catalan, Danish, Dutch, Finnish, Portuguese, Norwegian, Croatian, Hungarian, Polish, Romanian, and Turkish forums.
I have NOT tested this mod on non-Latin language forums.
With regard to your Cpanel error:
1. Do you have and use any search index (custom/fulltext) for your forum?
2. Did this error exist before your installation of this mod?