Why has my system got such slow boot times?

[Zombie21]

So I installed an 960 Evo m.2 SSD and since then my system has taken such an agonising length of time to boot.
I have an i7 7700k (clocked down to 4.4GHz due to thermal throttling on a h100i v2) and a ASUS TUF Z270 Mark 1 Motherboard.

 

[Zerk2012]

I have an i7 7700k (clocked down to 4.4GHz due to thermal throttling on a h100i v2
You have more problems than just slow boot.
How long does it take it to boot?

 

[Zombie21]

I have an i7 7700k (clocked down to 4.4GHz due to thermal throttling on a h100i v2
You have more problems than just slow boot.
How long does it take it to boot?

it takes around 50-60 seconds to boot, I have no startup programs so i know that isn't the issue.
On a side note My BIOS is extremely laggy, to the point where there is a 5 second delay between pressing the key and the action occurring.

 

[Zerk2012]

If your OK with doing things I would look for a BIOS update for the board, but the H100i should not throttle your processor at stock speeds.

 

[Zombie21]

If your OK with doing things I would look for a BIOS update for the board, but the H100i should not throttle your processor at stock speeds.

I honestly don't understand it my BIOS Version is 1009 (latest according to ASUS site) I've had the H100i v2 replaced three times as i thought this was the product at fault but the issue still remains. My only idea is that it is a thermal sensor issue or something to do with the board.