Calc, password protected file is much slower than non protected file

Dear all,
I have a password protected calc file which is quite slow at opening, saving, and first editing after opening. The same file is much faster and responsive if I remove the password protection.

Is this to be expected?

Thanks

This is something definitely worth reporting to bug tracker.

I wil, thanks

https://bugs.documentfoundation.org/show_bug.cgi?id=122377