Unfortunately, codeIgniter series v3.0 slower than series v2.0 twice.

I have used codeigniter started from series 2 and so far.

But I have noticed the beginning of codeigniter series v3.0, became slower than series v2.0.
And for this reason in my opinion, codeigniter has lost very powerful feature, namely the speed.
And in order to prove it, I've created a simple application using version 2, and another copy of the same application using version 3

When loading the page at the first time, the version 2 recorded (0.5000) of speed, while the version 3 recorded (1.5000) of speed.
as you seen the difference is double times.
Also when refresh the page at the second time, the difference is still the same, v2.0 recorded (0.3500), v3.0 recorded (0.8000).

Screenshot for version 2.2.1


Screenshot for version 3.0rc3


I think in my opinion version 3.0 come up with some improvements, but has lost more speed.