I'd understand if you don't want to discuss details but for the life of me I cannot understand how the total number of files can affect anything. What function

I'd understand if you don't want to discuss details but for the life of me I cannot understand how the total number of files can affect anything. What function does a sync app do which depends on total number of files? I can just do the sync file by file. It will take 10x more time to sync 100 files than 10 files. But why the brokenness?