Hi,
Thank you very much for the details, it helps us a lot.
Unfortunately ordering filter is not available yet. There is a huge filters rework at progress, we hope to finish it by the end of the summer.
This article will help you with the performance optimization. Generally, using filters is a performance heavy task, as it is very hard to cache and table joins are required. It is especially true for cases with a lot of items to filter. Using the least possible amount of filters can have a great impact on the performance as well.