Set a number of threads to run. Typically set the logical cpu count of your PC.
Set the thumbnail size used for drawing scaling images and preview. This size do not affect the final image quality. Normally you need not to change default 320 to an anothor value.
Set a maximum memory size used for the image cache. Larger value causes longer pre-loading. You need not to specify too large value. And as Miruno is 32-bit application so huge size may cause unstable behavior.
Set a number of files which attributes are loaded before displayed. Smaller value causes smaller buffering time so you can see images earlier. But available image proportions are too few "Auto-median" and "Auto-mean" grid proportions will be unusable.
Check if you want to topmost window with fullscreen mode. You need not check this normally.
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