The Microsoft Client Server Runtime Server subsystem utilizes the process csrss.exe for managing the majority of the graphical instruction sets under the Microsoft Windows operating system. As such Csrss.exe provides the critical functions of the operating system, and its termination can result in the Blue Screen of Death being displayed.

Csrss.exe controls threading and Win32 console window features. Threading is where the application splits itself into multiple simultaneous running tasks. Threads supported by csrss.exe are different from processes in that threads are commonly contained within the process, with various threads sharing resources within the same process. The Win32 console is the plain text window in the Windows API system (programs can use the console without the need for image display).

In mobile devices such as notebooks and laptops, the process csrss.exe is closely dependent on power management schemes implemented by the system as defined under the Control Panel option.
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csrss.exe is a system process that is needed for your PC to work properly. It should not be removed.

This process is considered safe. It is unlikely to pose any harm to your system. The csrss.exe file should be located in the folder C:\Windows\System32. Otherwise it could be a Trojan.

This process is considered to be CPU intensive. Without proper management, CPU intensive processes can manipulate system resources causing speed loss. Check the Microsoft Windows Operating System settings to see if you can turn off unneeded modules or services.