The read latency of 1% read request up to 50ms

how to find out fdb where is the time spent?
20B key and 1KB ~20KB value

Configuration:
Redundancy mode - triple
Storage engine - ssd-2
Coordinators - 5
Desired Proxies - 5
Desired Logs - 10
Usable Regions - 1

Cluster:
FoundationDB processes - 100
Zones - 5
Machines - 5
Memory availability - 8.0 GB per process on machine with least available
Fault Tolerance - 2 machines
Server time - 02/09/22 10:56:45

Data:
Replication health - Healthy
Moving data - 0.000 GB
Sum of key-value sizes - 153.737 GB
Disk space used - 568.661 GB

Operating space:
Storage server - 1267.7 GB free on most full server
Log server - 1267.7 GB free on most full server

Workload:
Read rate - 226 Hz
Write rate - 11586 Hz
Transactions started - 6399 Hz
Transactions committed - 5793 Hz
Conflict rate - 0 Hz

Backup and DR:
Running backups - 0
Running DRs - 0