Anyone notice some slow down in older iMacs?

[quickcalibre]

Hiya, not sure if this is an issue for anyone else?

But my iMac seems a very small fraction slower than it was on mavericks.

My last benchmark was on mavericks, to have something to compare to the new 5k iMacs when they come out and was this:-

NovaBench Score: 1395
2014-10-18 19:11:16 +0000
Mac OS X 10.9.5
Intel Core i7 @ 3400 MHz
Graphics Card: AMD Radeon HD 6970M

12288 MB System RAM (Score: 206)
- RAM Speed: 9139 MB/s

CPU Tests (Score: 793)
- Floating Point Operations/Second: 298347104
- Integer Operations/Second: 639352064
- MD5 Hashes Calculated/Second: 1258888

Graphics Tests (Score: 378)
- 3D Frames Per Second: 1600

Hardware Tests (Score: 18)
- Primary Partition Capacity: 930 GB
- Drive Write Speed: 55 MB/s

However updating it's gone down a bit.

NovaBench Score: 1233
2014-10-20 17:34:08 +0000
Mac OS X 10.10.0
Intel Core i7 @ 3400 MHz
Graphics Card: AMD Radeon HD 6970M

12288 MB System RAM (Score: 205)
- RAM Speed: 9048 MB/s

CPU Tests (Score: 815)
- Floating Point Operations/Second: 318746752
- Integer Operations/Second: 647552640
- MD5 Hashes Calculated/Second: 1266275

Graphics Tests (Score: 191)
- 3D Frames Per Second: 628

Hardware Tests (Score: 22)
- Primary Partition Capacity: 930 GB
- Drive Write Speed: 73 MB/s

Seems to be in the graphics test mostly that's gone down.

What do you guys think?