Memory problem, and other asking

Hello,

Thank you for the work that you have done, i really appreciate your plugin.

First of all, i am facing a problem, when i click on « admin.php?page=lmfwc_licenses », the page take too much time to load, and take a lot of ram allocated « » as you can see. At the begining it was crashing, so i made a debug to understand what is happenning, i found that it need a lot of memory to load, so i raised it to 512, so it was runnung normally but a bit slow. And now it need more then 70% of 512, to load, In the reality, now we have « 20.000 » codes stored and i cannot delete the old one.
Please help to solve the problem of the memory.

Second, i need to customise the plugin to let the user the capability of disabling a code, which show him that he already used that code.

Third, I need to know how i can decrypt the code stored on the databse ?

Thanks

I want to thank you another time for the works that you have done.