Thanks for the update.
GridDynamicFilter performance problem.
We hardly tried reproducing the reported issue, but if you are loading more records the CPU performance will be little bit high. But considering GridGroupingControl performance it had been highly provided to resolve performance related issues.
Please let us know the following concern.
1. What is the Essential studio version you are currently using?
2. Please provide us the modified sample of the GroupingPerformace sample so that we can figure out what exactly you have tried.
Please let me know if you have any concerns.