Why StringTemplate could be slow?

I'm using StringTemplate as view layer for my web application. Recently I've meas开发者_StackOverflowured how much time is spent rendering pages and it's around 50ms for simple pages and 500ms for complex pages. This is too much for my needs, so I'm looking for a way to improve ST's performance. How can I do this?

Most of the time is consumed by the StringTemplate.toString method, so it's not a cache problem.

I actively use anonymous templates and included templates - could this be the cause?

use write() not toString then writing to your stream. write() will render and transmit w/o buffering. big difference. Ter

Is that the Terence Parr?

I think what Terence meant is

template.write(new AutoIndentWriter(response.getWriter()));

however I can not beieve that will make any noticeable difference.

You should time two things separately

String str = template.toString();  // 1
response.getWriter().print(str);   // 2

the slowness is probably on the 2nd line which involves IO.

If you use toString() Memory is going to large.

Check your memory when run load test with toString() case.

If your memory is enough. Two case is the same time.