PHP Storm is extremely slow when synchronizing files or just uploading changed files. It clearly does it one file at a time. When I upload files via FileZilla with the concurrent file uploads option turned on (set to 10) it is blazingly fast. Literally 10x faster than PHP Storm. There is an option to "Limit concurrent connections:" under advanced options under deployment, and the speed of uploads remain the same whether I have it off or on (and set to 10).