Any way to speed up the process of locking?

[pavan-kalyan]

Currently, it takes 2 or more seconds to lock my screen (after pressing mod + l) on my multi-monitor set up (1 external monitor + laptop screen). I presume this is because of the image conversion and xrandr info collected.
But during this period, I can still interact with the machine.
Is there anyway to lock the screen and set the images later when ready or just speed up the processing (maybe by allowing some configuration on quality/speed of conversion?)

This is the command I'm currently using
i3lockmore --image-fill ~/.config/i3/i3-lock-screen.png
The image is approximately 4MB (If that can have a noticeable impact).

[DadiBit]

An easy way to do this would be by caching the resulting image, but only if it is static (no screenshots). I have already achieved this partially with i3lock.
The following things should be cached:

• The blurred static image
• The static image path (or maybe a fast hash?)
• ImageMagick convert parameters (if they change the blurred image should be recomputed :/ )