13" Retina Macbook Pro slight trackpad lag

Okay, so i tried booting in safe mode, but the lags still occurred. I also did a complete format and reinstall of my system, without improvements.

I did some more testing, and it turns out, that the lags also occur when scrolling after not having used the trackpad for a few seconds. I noticed that the keyboard also has a slight input lag if i let it sit idle in a text document (for a few seconds) and then start typing - there will be a slight delay until the first letters turn up on the screen. The lags are very tiny, but i don't notice them on my sisters older non retina 13" MBP.

This is really strange...
So i plugged my external mouse in (Logitech G9), tried to use the trackpad and then the lag was 100% gone. But as soon as i pull the external mouse out of the USB, it goes all laggy again. What is going on here? Is it some kind of power-saver that turns off the trackpad until the very moment it is touched? I am very confused....

At least it is nice to hear that somebody else is noticing this, and that it isn't just me being oversensitive to lag..

I tried some other things to solve the problem:
1. Install mouse acceleration software called "SmoothMouse" with no success.

2. Install ControllerMate and tried to create a virtual mouse to simulate the input of an external mouse - also with no success.

In the upcoming week i will try to take my MBP to the local apple store and let them have a look at the problem, and i will try and see if i can compare my trackpad lag with some of the other MBP's in the store.

I just recently converted to Mac from PC, and have never experienced any sort of input lag like this before, no matter how sh***y the PC has been.... so i am pretty dissapointed from seeing it on a >2000$ machine that otherwise runs extremely smooth 😕

I spent my day today walking around in all the apple resellers in my city testing their MBP's for input lag, and i was not able to detect any - only 1 out 5 had the same issue as me - strange.

Afterwards i took my MBP to an apple reseller to troubleshoot and they just sent it to repair straight away without even looking at it - their hardware diagnostics couldn't detect anything though.

So now i will have to wait a couple of weeks and see if they find anything....

I actually contacted Apple Support and they told me that this is common for all MBPs and that nothing should be done about it - so i guess we will just have to live with it then, sadly.
They couldn't give me an exact explanation to why it is happening but i'm guessing it is just a power saving feature of some sort :/ - If so, they should at least disable it when the power adapter is plugged in - or give us the option to disable it totally 😟

I also wonder if the "issue" is still there in Yosemite....