How to Coss down SFMap load?

[AliexChang]

Hello everyone:

Now , When i use paint mask and masktoline , if mask lenght > 6 map loading will be big

( i show system time on GUI , 10ms)

How to Coss Down SFMap Loading when it paint line?

Ex:

When i draw mask (lenght < 6) && (Line <6) , map work is ok

When i draw mask (lenght < 255) && (no Line) , map work is ok

When i draw mask (lenght > 6) && (Line >5) , map work is lag (0.5s~1s)

When i draw mask (lenght > 20) && (Line >19) , map work is lag (2s~3s)

When i draw mask (lenght > 200) && (Line >199) , map work is lag (6s~9s)