step 1 : Log into your cPanel dashboard.
step 2 : Using the file manager, navigate to your WordPress site’s root directory.
step 3 : Locate and open the .htaccess file for editing.
step 4 Add the following line of code at the top of the file:
SetEnv MAGICK_THREAD_LIMIT 1
step 5 Save the changes to the .htaccess file.