Symptoms
User Interface very slow with DWP work processes with a very high %, AE running on MS SQL server.
In the log files, you can see some DEADLOCK
Cause
"VERSIONING" mode of DB is not enable
Resolution
To check if versionning mode is turn on or off
From the UC4's database perform following statement
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SELECT is_read_committed_snapshot_on
FROM sys.databases WHERE name= 'your database name'
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if the value " is_read_committed_snapshot_on" = 0 the Versioning is off
Then you should ask your DBA to turn it on, it will help to reduce the occurrence of deadlocks.