Spectra plugin delay in backend

We have been encountering Lag on the back end while using spectra plugin on our sites, the site provided can be tested and whatever page you click on the back end even moving from pages to posts in the menu has a 2.5 seconds delay (only when spectra plugin activates), it is instant without spectra plugin.

I am not sure why spectra plugin would bring this delay but it is terrible. also when editing pages the delay in actions can impact productivity badly.

Note:
We are using Openlitespeed as web server.
This happens on multiple websites we are using Spectra.

Some details on what we can do to remove whatever the respective plugin is doing to create the delay woudl be great.

Thank you.