I am having 40-60mins building time on 5.6.2
Anyway i can reduce this.
I am comming from 5.3 to 5.6 and i never encountred this huge building time before
Could that be an antivirus running in background?
Dont think so. I have been using kaspersky antivirus for longtime and in 5.3 i never had problem. But in 5.6 it takes too long the initial build
Can you submit a bug report with a repro project for this? Or can you tell us where it spends more time then before?
Did you change the compression settings by any chance?
yes compression settings is changed to crunched for most of textures
I was referring to the compression settings for the build itself you can find under Player Settings > Publishing Settings > Compression Format.