Comment by HenriNext

The filters are used to seek from database files, so lookup/query side performance is not major issue (Xor filters were mainly interesting because of the smaller size). Normally a secondary index would do the job fine, but because of the high sustained rate there is no time to write it. And all CPU cores are already maxed out, so moving more to background doesn't provide net-benefit..

+Thanks everybody for your encouraging words :)