dynaTrace AJAX Edition is a free tool for diagnosing & preventing Ajax performance issues.

The tool runs on IE & measures the performance of your AJAX application as real users are feeling it.

It traces & analyzes AJAX calls through their entire round trip (DOM event, JavaScript, HTTP request, avaScript callback) and displays network traffic, CPU load, execution times & more.

dynaTrace AJAX also records every session for future offline analysis.

MySpace is sharing an open source project named MySpace’s Performance Tracker which is an Internet Explorer plugin for capturing and measuring possible bottlenecks on webpages.

The plugin is a great helper to developers for:

• measure the CPU hit and memory footprint of your pages
• reviewing screenshots of the page while it renders
• reviewing rendered HTML on each point of the page’s lifecycle
• viewing estimates of the time it takes to render each section of the page in different connection speeds
• validating the content of pages against a set of proven “best practice” rules of web development. 

P.S. The tool is currently in pre-alpha state.

For every web designer & developer, refreshing the browsers to see the updates we make is a very common action.

XRefresh is a solution, specifically built for easing this process, which automatically refreshes browsers once an update to a file in our project folder is done.

It comes with 2 parts: a browser plugin (both for Firefox & IE) and an application (for Windows & Mac) which watches the changes made in the folders we mentioned.

Although it is handy for systems with one monitor, the best environment will probably be two monitors where the IDE & the browsers runs on each.

P.S. For Firefox, it requires Firebug to be installed.

DD_roundies is another rounded corners solution that is very easy to implement & cross-browser compliant.

This rounded corners script doesn’t use any images, works in IE6 without AlphaImageLoader & lightweight (3.62kb compressed).

Radius of the corners are not fixed & can be defined.

As the major problem for rounded corners lies beneath IE, this rounded corners script uses VML (inspired from Jonathan Snook’s solution). A possible future problem is IE8 -currently- does not support VML.