TC 15.53/54 Slow down

Hi everyone! 

Since the latest release, all my test case are slowing down compared to TC 15.52. For example the same Test :

with 15.52 :

And with TC 15.53 :

All operations are much slower. like Sys.Keys("some text"). With TC 15.52, it takes 0.17s. With TC 15.53, 0.49s.

Overall, the execution time has been multiplied by 3.

for the moment, I have to revert to TC15.52.

Do you know where this can come from?