Shrink map size?

I want to use a map called rp_littletown on my server but the size of it is 100mb which is a turn off for users joining, how do I shrink the map size so more people join?

doesn’t sound like a very little town to me

you cant, the map has a lot of custom textures/models
thats the cost of a good looking map really

You could unpack the map and upload the content onto workshop (Models, materials, sounds) and then just upload the map without the content onto your FastDL the size will drop significantly and workshop will heavily compress the content. I got a 100MB map down to 30MB using this method (Workshop compressed the content to 30MB)