Hello Titush,
The plugin is installed on almost 30,000 websites and some of them are quite big installations. I have seen our plugin monitoring a 500 sites multisite installation and memory was not an issue.
I am telling you this because when there are memory issues usually they are edge cases, i.e. the issue is caused by something that is very specific to that particular setup.
Definitely we are always willing to help everyone who has an issue but cannot guarantee that we will find one or that it will be the same case like yours. To be honest we haven't had a memory issue in quite some time, we've invested a lot of time in optimizing the plugin :)
Maybe you can give us more information such as:
1. Does the memory consumption happen immediately upon activation?
2. Can you pin point a specific change that might be causing the plugin to consume so much memory?