The only way to speed up synchronization is to set options ignore_regexesto exclude large folders that will not be edited (for example, libary folders).
You can exclude folders by setting something like this:
"ignore_regexes": [
"/var/www/someFolderLike/Lib/Zend/",
"/var/www/anotherFolder/",
]
Folder paths may need to be relative to the root path of your server.
source
share