Loading scenes on Button Press Gets Slower Over Time

I have a button that loads a new scene ; on that new scene I have another button which loads the previous scene. So it keeps loading scenes when you click the buttons.

ANyway, it all seems to work but the fps just gets slower and slower over time. Presumably there is some garbage collection I need to do manually or something? Or should I not be using loadscene over and over?

Each button just runs this:

        console.log("Button clicked"+sceneToLoad);

I think in the end this was something to do with the chrome extension Cocos Creator Devtool
1.0.5 that I was using. I disabled this and it seems to be ok.