I believe I have used it Photoshop People who open PSD to fill color, enter text, adjust visible layer, etc. can't be displayed in real time. It can only be displayed after zooming in or out or using the move tool to move.
This problem occurs not because your machine is poorly configured, but because you are using a low version of PS. Another possibility is that you are using a green cracked version instead of an installation version. The solution is:
It is recommended that you use Photoshop CS5 and above, or you can set a temporary storage disk (shortcut key Ctrl+K). In the preferences window, select the "Performance" menu on the left, and adjust the memory usage to 60%~70%;
Adjust the cache collage to the maximum value of 8, and set the history to 30.
If the version you are using is PS CS3, select Edit - Preferences - Text - Cancel Asia typeface Check in front of the option, and then click the "Performance" tab on the left, adjust the temporary disk to a larger drive letter, and restart Photoshop.
If conditions permit, it is recommended to replace the independent video card. The larger the video memory, the faster the image processing will be.