Hi Orzola,
As always is similar cases, I can offer you running a special build that will log down the times needed for doing specific operations, to try and find out the bottlenecks, i.e. tasks that take the most time to process and thus make the refresh slow.
You need to confirm that you are willing to run this build and report results. If you are, please send me a private message on the forum or email to the support to initiate this test.