Using trim fails on Windows RT. It is not compliant with Perf test. I'm tried to update an other app, it failed again (and it was certified many times on Windows 8.0)
Trim takes too much time, more than 5 seconds after restoring the app, and fails the performance test. But if I remove it, it fails to an other test (The new Trim required test).
Right now, the only solution is to drop Windows RT (ARM platform) until Microsoft is fixing the WACK test or the trim function requirement. I'm working right now with someone at microsoft which is testing the app and he's agree that my app is perfectly fine
on Windows 8 and Windows RT, regarding the performance test. However it fails at Microsoft test labs.