i am using umbraco 12 backend admin working slow i am not able to create document or page opne it's take to much time some time load fail

This is not a question about package development for Umbraco it looks like, either use #1443515195891646537 or even better ask your question on the forum: https://forum.umbraco.com A little tip: this question is not going to get much of an answer unless you provide more details on what you have tried, what you have been able to diagnose already, etc.

I think the first thing people will say is upgrade to Umbraco 13. It's the LTS version everyone is using so should be more stable and not difficult to upgrade.