I agree to no1youknowz, I can't wait too long with CI4 it maybe a year before the stable version released. and I guest in that time there will be a new technology and we have to upgrade again and again.
God Bless CI Contributors
Informally (haven't seen a formal definition), in my eyes, CodeIgniter has always been a micro-framework. :-)
Currently you need to download 1.5 MB zip-archive. Ok, let us assume that some portions of source get stripped and the compressed source of the so-called micro-framework takes about 1MB. What is the point of that. It would be useless burden.
If this would take even a bit of the focus of the dev team I vote no.
My vote's reasons are:
1) I think CI already performs great. I believe that if CI4 will require PHP7 the performance will increase a lot.
2) CI should focus on the majority of the community. If you have a website that is having huge traffic and you can't solve it by caching, upgrading servers or optimizing in any other way then you should go for another framework.
3) The framework is already so light... What could even be taken out that would speed things up? Would we be worried about making theoric tests look better? What performance tests would be done?
I saw something about serving static html? What? Lol Why would you use a framework for that? Just create a html with the framework and then point directly to the HTML file. It sounds a bit silly but maybe I got it wrong...
Anyways... CI4 will be decisive for the future of CI and I think that the previous concept that Elislab started is perfect and should continue without too many distractions and "side projects".