Skip update static files in dev mode

[lamyseba]

Hi.
When I launch hugo server, my site take about 2 minutes to do the initial build. I have got a lot of images, and thumbnails of this images, so there are like 1750 static files, a lot of wich do never change. I launch the server with “–render to disk” and “-d” option, but it seems hugo still copies all the static files, even if they already exists in the destination directory. Is there a way to prevent hugo copying already existing static files when launching the server ? The options --noChmod and --noTimes didn’t help to shorten the initial build time.

[lamyseba]

The thumbnails are generated within Hugo itself. But once generated, cached, and copied to the destination dir, all this process could be skipped, especially in dev mode, where the auto-update feature is enough (most part of the website doesn't change). My website source is here: https://github.com/pau-a-velo/pau-a-velo-websource

[lamyseba]

Hi! I suppose this issue is related to #5880, because recently somebody with a mac built my site, and the first time the "first build" took about 20s, and the second time the "first build" (relaunching server) took only 2sec. But on my windows machine (surface 3), it always take more than 2 minutes, be there unused theme or not.