Quotefilter is very slow in my case.
Yes Patrick, You're absolutely right, because filter use core customfield from VirtueMart (But You know then customfield from VirtueMart isn't correctly implement ID for indexing, because You was in VirtueMaert Developer Team, isn't it?)
In another shop we use external solution for customfiled in VirtueMart, then we have 220 000 products with 1200 customfiled for filtering and eshop is very quickly.
For new eshop we prepare new solution :)
But thanks for feedback.
Rudolf