Hello,
Thanks for reaching out!
There is no limit set as to how many tickets can be created for a page or event. It is virtually limitless.
Looking at your system information – thanks for sharing upfront – I see that you have quite a low memory allocation (40M) for your site. Before doing anything else I would try to up that to 128M or even 256M and see if that helps.
The execution time of 30s is a default value. In most cases that should be sufficient. If the memory increase doesn’t help, then you can try to up that to 60s in parallel.
These are settings on the hosting server, not in WordPress, so you will need to get in touch with your hosting provider or server administrator.
Let me know if that solves the case.
Cheers,
Andras