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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 also need need to investigate the TeamCity agent machine which is running the build and also the server.

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, maintenance times, 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.
Check if you have any Conflicting Software like anti-virus running on the machine and disable/uninstall it.
Check that the database used by TeamCity and the file storage of the TeamCity Data Directory do not have performance issues.

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

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Then send us a detailed description of the issue accompanied with the thread dumps and full server (or agent) logs covering the issue. Unless it is undesirable for some reason, the preferred way is to file an issue into our issue tracker and let us know via feedback support email. Please include all the relevant details of investigation, including the CPU/IO load information, what specifically is slow and what is not, note affected URLs, visible effects, etc.
For large amounts of data, use our FTPfile upload service to share the archives with us.

Server Thread Dump

When an operation on the server is slow, take a set of the server thread dumps (10+) spread over the time of the slowness. TeamCity automatically saves thread dumps on super slow operations, so there might already be some saved in logs/threadDumps-<date> directories.
It is recommended to send us an archive of the entire content of server's <TeamCity Home>/logs/threadDumps-<date> directories for all the recent dates.

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