It's a wonderful idea but i have some concerns i would if someone could challenge them: 1. Some people are on limited bandwidth plans, this adds to the plan si

It's a wonderful idea but i have some concerns i would if someone could challenge them: 1. Some people are on limited bandwidth plans, this adds to the plan since i am downloading and uploading data, and if the data that has to be processed -coming from the server- is big then this is going to kill my bandwidth. 2. This could slow down a lot of mobile devices that are JS capable, or old/moderate hardware. 3. Memory leaks? 4. If a startup is based around this idea, and me as a published i'll use their JS code to run tasks, then i'm basically giving them a key to my site :). Other than that, the idea it self is awesome, if it could be implemented through : 1. Asking user permission. 2. work on idle browser tabs only. 3. used for non-profit organizations to solve real problems, maybe to fight cancer or to analyze data coming from space.