Low speed when upgrading to smarter Mail 16

Hello

We have some mail servers which have been working very stable and speedy with smarter mail 15.x,

After we upgraded to 16.x version, we are facing considerable low speed in web interface.

The server Memory/CPU/Disk usage is normal but still the web interface is working on low speed.

what is the problem?

Is there any answer for this problem?

we are also experiencing sloooow user interface. 15 is like 10x faster

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