If you've indeed found a way to improve the performance of the EsxTop ZenPack then please open a defect ticket at jira.zenoss.com and explain how you did it.  It will then make it in to a future release of the ZenPack.

Thanks.

I created an issue to JIRA: https://jira.zenoss.com/browse/ZEN-9161

Not much activity has happened since then. You can use the Zenpack from the GitHub simply by cloning the repository and installing from there (zenpack --install=<repository directory>). This will copy the files under the ZenPacks directory.