Hello.

I need a lot of help on how could I improve the performance on my site.

I have this navigation tree which is using JavaScript.
The tree is implemented inside a block. The tree nodes are links to my Drupal nodes.
When the user clicks in any of the links, it serves the page on the main content pane and at the same time redraws the block (tree). Now I have thousands of nodes in this tree. It's taking a lot of time to redraw the tree. Do you have any suggestions on how I could improve the performance?
Does Drupal Support frames?

Thanks.
pol