To answer this question, the user needs to have knowledge about Cognos 8 BI and the techniques that can be used to improve the performance of PowerCubes.

Option A: Run the cube through the pcoptimizer utility that is shipped with Cognos 8 BI. This option is correct. The pcoptimizer utility is used to optimize the performance of PowerCubes. It can be run on the cube to improve query response times and reduce the cube size.

Option B: Enable the Allow dynamic usage of dimension information governor in Framework Manager. This option is incorrect. The Allow dynamic usage of dimension information governor controls how much of the dimension information is loaded into memory. It does not directly improve the performance of PowerCubes.

Option C: Edit the EnablePCOptimizer entry in the Cognos.ini file so that its value=1, and then rebuild the cube. This option is incorrect. The EnablePCOptimizer entry in the Cognos.ini file is used to enable or disable the PowerCube optimizer. Enabling it alone will not improve the performance of PowerCubes. The cube needs to be rebuilt after making the change to the Cognos.ini file.

Option D: Ensure that the Pass-through SQL setting is enabled on all regular dimensions in the Framework. This option is incorrect. The Pass-through SQL setting is used to pass SQL statements directly to the database. It is not directly related to improving the performance of PowerCubes.

Therefore, the correct answer is:

The Answer is: A. Run the cube through the pcoptimizer utility that is shipped with Cognos 8 BI.