Slowness, Hangings and Low Performance

Determine Which Process Is Slow

If you experience a slow TeamCity web UI response, checking for changes process, server-side sources checkout, long cleanup times or other slow server activity, your target should be the machine where the TeamCity server is installed.
If the issue is related only to a single build, you will need to also investigate the TeamCity agent machine which is running the build.
Investigate the system resources (CPU, memory, IO) load. If there is a high load, determine the process causing it. If it is not a TeamCity-related process, that might need addressing outside of the TeamCity scope. Also check for generic slow-down reasons like anti-virus software, etc.

If it is the TeamCity server that is loading the CPU/IO or there is no substantial CPU/IO load and everything runs just fine except for TeamCity, then this is to be investigated further.

Please check if you have any Conflicting Software like anti-virus running on the machine and disable/uninstall it.

If you have a substantial TeamCity installation, please check you have appropriate memory settings as the first step.

Collect Data

During the slow operation, take several thread dumps of the slow process with 5-10 seconds interval. If the slowness continues, please take several more thread dumps (e.g. 3-5 within several minutes) and then repeat after some time (e.g. 10 minutes) while the process is still being slow.

• Server thread dump
• Agent thread dump

Then send us a detailed description of the issue accompanied with the thread dumps and full server (or agent) logs covering the issue. Please include all the relevant details of investigation, including the CPU/IO load information, what specifically is slow and what is not, note URLs, visible effects, etc.
For large amounts of data, please use our FTP.