The first tests carried out on IE8 Beta 2 revealed that it was much bigger memory and computing power over its rivals. 

Craig Barth, an analyst at Devil Mountain Software, a company involved in testing the performance, performance and compatibility of software, has just published a study on the consumption of system resources of different browsers (with the exception of the new Chrome ). The objective was to understand whether the new Internet Explorer 8, Beta 2 has just been put online, is comparable to 3.01 Firefox, Mozilla, which had worked hard to reduce memory requirements.
The study had resulted in a rather negative finding, a kind of call by Microsoft for the final version, it addresses certain shortcomings. By opening a sample of 10 sites, there is a consumption memory of 380 MB for Internet Explorer 8, 250 MB for version 7 and only 159 MB for Firefox 3.01. Second, it is interesting to count the number of processes carried out by different browsers: Firefox has opened 29 process, IE7 stopped at 65 and IE8 has accumulated 171 open process. Finally, a look at the use of the processor, on a Core 2 Duo 2.66 GHz Firefox has reached a 33% consumption of computing power with Windows XP and 48% with Windows Vista. IE7, however, has reached 13% and 24% XP with Vista, while qu'IE8 came to be placed between the two with 22% on XP and 33% with Vista.
If the tests can be considered reliable, it is clear that the core of Firefox is currently more efficient than IE. Firefox requires fewer resources and is fairly complete in several respects, while the new Microsoft browser appears to be a little more greedy with respect standards not yet finalized.
Craig Barth tried to explain that innovation and performance on some fronts can also be interpreted as handicaps on others. The number of process opened by IE8 and with which Microsoft seeks to optimize its browser for multi-core processors, a weapon that could be useful in the future is, so far, a great disadvantage.