CoronaMtl Transparency mask

Corona Corona for 3ds Max Help Required
1

Hello guys,
After using the custom mask in transparency slot render times are getting huge, any ideas? as you can see render time doubled and it is more noisy as well. the mask is very simple, plane white with dark spots.

2

my guess - bitmap paging on

3

( see this https://forum.corona-renderer.com/index.php/topic,1662 )

4

It helped! Big thanks guys