i am surprised after reading these issues...i was a proton preve cfe 2012 owner which i sold last year..the same issues of the throttle response was poor and it needs a second or two to respond , rattling sounds all were in my preve and more than that..

i am surprised the new persona has it.. the lag i think its due to the cvt , the engine (campro or so called vvti engine) has never been economical when new..after more mileage only it can become better..i have used the previous persona also..not so economical..