Black screen when add new item in template

[irrWN]

Hello,

I have installed Zabbix 6.2.9 (4 cpu, 16 ram, 200 GB HDD) with more than 7000 host items with different templates. PostgreSQL 14.5 compiled from source with all additions is used as a database ( 8 cpu, 32 ram, 1TB HDD) .

Postgres config:

max_connections = 300
shared_buffers = 8GB
effective_cache_size = 24GB
maintenance_work_mem = 2GB
checkpoint_completion_target = 0.9
wal_buffers = 16MB
default_statistics_target = 500
random_page_cost = 4
effective_io_concurrency = 2
work_mem = 3495kB
min_wal_size = 4GB
max_wal_size = 16GB
max_worker_processes = 8
max_parallel_workers_per_gather = 4
max_parallel_workers = 8
max_parallel_maintenance_workers = 4​

Zabbix-php-fpm.conf

pm = dynamic
pm.max_children = 50
pm.start_servers = 5
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 200

php_value[session.save_handler] = files
php_value[session.save_path]    = /var/lib/php/sessions/

php_value[max_execution_time] = 300
php_value[memory_limit] = 128M
php_value[post_max_size] = 16M
php_value[upload_max_filesize] = 2M
php_value[max_input_time] = 300
php_value[max_input_vars] = 10000

I recently ran into a problem with adding new data elements to a template. When I add a new data element to the template, zabbix thinks for a very long time and then just shows a black screen. (Screenshot attached)
I do not understand what this problem can be connected with and how it can be solved.