子域的增加是否有助于加快多个ajax结束？

Question

I have a doubt regarding the multiple ajax calls.

Consider I have 100 ajax calls to make. If I used a single sub domain it is taking 30 sec to finish. But if I use 2 sub domains it is taking 20 secs & if I use 3 sub domains it is taking 18 secs.

All the Ajax calls are dynamic. The time to finish a call is a max of 3 sec. Each call need to communicate with db. Previously I had a single db for all the 3 sub-domains. Now I created 3 different databases.

My concern is to get them finished in 10 secs.

Any suggestions please.

KR

Answer 1

The problem you're describing is the limit of simultaneous connections that browser opens per single hostname. If you have many calls to one server, some of them will need to wait before the others are finished (which causes delays). If you distribute resources between servers you get around this per-server-limit and they run simultaneously. However for small amount of data it is usually wiser to just merge requests together and send as one package, as otherwise you loose time for each request to get back and forth + repeating useless headers, opening connection.

Check here for the current limits per browser. They might be nto strick implementing those limits, though. http://www.browserscope.org/?category=network