I have a hidden electron browser window which acts as a photoviewer for the main app.
Whenever users open a high resolution image it would take some hundred milliseconds to paint that image.
How to mitigate the needed duration to paint the high resolution photo on photoviewer ?
The time required to paint a picture with a certain resolution depends mainly on the performance of the user's device.
But you can use the following method to make users feel that it is faster：
Load a low resolution image or a loading image first, and replace it when the high resolution image loaded.