I've made some updates to try and improve performance. There is a performance cost when adjust morphs and ExpressionTool previously updated morphs every frame. I've updated it to allow setting the expression update framerate independently of VaM's framerate (it won't be able to update faster than VaM is actually running, of course). You can now set the update framerate between 1 and 120 (the default is 60). Higher values will be smoother at the cost of performance. Going as low as 30 can help with performance, but things may start looking choppy if you go much lower than that.
I've also added the morph settings to the saved preset, so those will now save and load along with the list of morphs.