I'm sorry its not working for you. I'm not using anything more than the standard plugins you get with construct2. I've even dropped using webgl for anything other than the acceleration it gives. I think I need to introduce some options that allow sprite counts etc to be turned down.
I generally use chrome to dev/test. My PC is a fast one though. I've also tested on a nexus 7 in chrome. Runs at a reasonable pace. I'm hopeful that cocoon will help speed further.
Thanks for the feedback :)