I would advice you to submit a support case.
In the meanwhile, there are other tools than Tableau performance recorder you can use such as TabJolt, TabMon, Replayer, Scout, etc. See the page below:
There are many factors that can affect performance in Tableau (and most of the time, it would be related to dashboard design).
We would recommend to use the performance recorder and have a quick check of this list:
And finally, the "Bible" for performance issues:
- Designing Efficient Workbooks (Whitepaper)