[Q] Quickest ROM for Galaxy S3 i9300 (1 GB version) topic

Tried to do a couple of searches on the topic, but couldn't find any conclusive answer.

A quick recap:

1. rooted my Galaxy S3


2. tried cm11 -> crappy performance, poor responsitivity


3. went to cm 10.2 -> still crappy performance and responsitivity


4. then 10.1 -> even if a little bit better, still unsatisfacted

Now, maybe my expectations for a 3 year old device are a little bit unrealistic but...what would you reccomand to a guy whose only concern is rom responsitivity in switching between apps / recalling keyboard / going back to home page? Bleeding edge features... I don't care about them...the faster, the better! Any hint? And thanks..:o