Yes, Microsoft has made improvements to address the slow down issues in Excel 2010. Here are some steps you can take to improve performance:

1. Disable unnecessary add-ins: Go to File Options Add-Ins and disable any add-ins that you don't need.
2. Clear the cache: Go to File Options Advanced and under the General section, click on "Clear" under the "Excel Options" section.
3. Disable animations: Go to File Options Advanced and under the Display section, uncheck the box for "Animations in task pane".
4. Disable hardware acceleration: Go to File Options Advanced and under the Display section, uncheck the box for "Disable hardware graphics acceleration".
5. Reduce the size of your file: Remove any unnecessary data or formatting from your file to reduce its size.
6. Use the 64-bit version of Excel: If you have a 64-bit operating system, use the 64-bit version of Excel to take advantage of the additional memory.

By following these steps, you should see an improvement in the performance of Excel 2010.