Hi Jacek,
In default settings, license check and decryption happens "Once per program". This means license check and decryption happens once the protected method is executed and it remains valid until it is closed.
Please add your application in envelope and check these protection settings -
You can try to modify these settings to find the sweet spot for you application that has the optimal performance.
Please note that this is a trade-off between security and performance as each setting (if On) works as an additional level of security.
You may also like to upgrade to latest version LDK 7.8 as the new envelope may have some performance improvements.
I have shared the steps to contact support portal on your other post-
Regards,
Ashish