Performance of a Vaadin front end on Apache Tomcat

The main form of my Vaadin application (running on Ubuntu server and Tomcat) takes enormous amount of time to load (more than 1 minute).

It's very simple and the web开发者_开发百科 server is not under load (only a couple of users access this web server).

How can I find out why this performance problem occurs (and where is the bottleneck) ?

Vaadin by itself takes just couple of kilobytes per application. Try not to load lots of views and data in memory upfront in init. Instead, do that lazily.

I am also relatively new to Vaadin, but I can tell you this is not normal. We are running our Vaadin application on both Tomcat 6 and 7 with only a few seconds of start up time (Mac O/S). We deploy to Fedora for production.

Vaadin does take a lot of memory, and I would suggest that you check your Tomcat startup parameters to see how much is used and maybe increase it. This is the -Xmx512m switch when you run TC or any java app. I would say that 512m is really an absolute minimum for Tomcat/Vaadin for testing and 5 to 10X that or more would be used for a production environment.

Java memory defaults depend on your version of java and could be insufficient.

Smaller of 1/4th of the physical memory or 1GB. Before J2SE 5.0, the default maximum heap size was 64MB.