igfxpers.exe belongs to software Intel® Common User Interface and is sometimes used by nVidia graphic cards drivers. It is responsible for enabling display resolution settings to persist when a monitor is disconnected or turned off. Although it might not be essential for desktop computers, many notebook devices might require this process to run on startup. This process can easily be stopped from running on startup from the msconfig and is not essential to Windows 7 or higher operating systems. This file can be usually found in %windir%\system32
On UMPCs this process is essential if you run the display in a scaled resolution, i.e. any other resolution than the native screen resolution (which is 800x480 for all the 2006 era UMPCs with 7-inch touch screen displays). When you shut down/standby/hibernate the UMPC, this process will return the display resolution to 800x480 so that when it restarts the display will be synchronized with the touch screen resolution. If you disable this process, then the screen will not be dropped to the native resolution and when you restart, your touch screen and display will be scaled differently.
Non-system processes like igfxpers.exe originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.

In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the Intel Common User Interface Module process. To access the Task Manager, hold down the Ctrl + Shift + Esc keys at the same time. These three buttons are located on the far left of your keyboard.

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

This process is not considered CPU intensive. However, running too many processes on your system may affect your PC’s performance. To reduce system overload, you can use the Microsoft System Configuration Utility (MSConfig) or the Windows Task Manager to manually find and disable processes that launch upon start-up.

Use the Windows Resource Monitor to find out which processes and applications write/read the most on the hard drive, send the most data to the Internet, or use the most memory. To access the Resource Monitor, press the key combination Windows key + R and then enter 'resmon'.