odoo v14 enterprise

my server specifications
10vcpu
64 ram
500 nvm

odoo conf file

workers = 21
limit_memory_hard = 36214400000
limit_memory_soft = 30971520000
limit_request = 8192
limit_time_cpu = 600
limit_time_real = 1200
limit_time_real_cron = -1

I have a problem with POS
I have more than 12 points of sale working at the same time
When the request is approved, it takes about 15 to 25 seconds
This is new to me. I had about 8 points of sale and there was no problem
Now I have 12 working points of sale
And this problem occurs
Is there a solution?