Concurrent AJAX File Upload LIMIT

I'm doing multiple file uploader to upload my files by using XMLHttp 2. When i'm doing this, if i upload the files one by one (by sending a file through an ajax request and waiting

Solution 1:

There's no theoretical maximum for the number of concurrent uploads (unless the browser builders put one in explicitly).

However, in practice, upload speed performance drops significantly after two or three concurrent uploads due to bandwidth choking, with the exception of very low latency whereby the tcp window limits the maximum speed of a single upload.

I would recommend setting a concurrency limit of 2, especially if you're providing this to external users whose bandwidth may vary. Alternatively, you could do speed benchmarking as well, adapting the concurrency level based on measured upload performance.