DursunCan http://prntscr.com/r1pj7m The directory in the picture takes up 352M https—repo.packagist.org. Previously all of my forum directory was 120mb compressed and now it is 510mb compressed. this happened over the course of 1 week. I just installed a few plugins in this process.
luceos That's a cache directory for composer, it doesn't necessarily need it but speeds up any composer action. It holds information of other php packages, their versions, dependencies and compatibilities.