Why is my late 2009 iMac 27" score so low?

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Average score for iMac11,1 - Late 2009 is 941

I have 12GB of RAM. Why do I have a 748? It was running slower under Yosemite, am now running ElCapitan public beta. Have optimized, cleaned - why such a low score? Any help appreciated.

2015-09-27 15:30:41 +0000
Mac OS X 10.11.1
Intel Core i5 @ 2660 MHz
Graphics Card: ATI Radeon HD 4850

12288 MB System RAM (Score: 181)
- RAM Speed: 4256 MB/s

CPU Tests (Score: 404)
- Floating Point Operations/Second: 126541840
- Integer Operations/Second: 266359456
- MD5 Hashes Calculated/Second: 943830

Graphics Tests (Score: 146)
- 3D Frames Per Second: 436

Hardware Tests (Score: 17)
- Primary Partition Capacity: 930 GB
- Drive Write Speed: 50 MB/s

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The iMac11,1 actually came in two models. One with a Intel Core i5 (yours), and another with an i7. The score for your iMac is actually as expected for your model (with a small increase from your additional RAM). The score on our chart is the average of the 2 models.

Are you having problems with your computer?

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Oh, I didn't realize that! That's good to know, thank you!

It had been starting up very slowly and running sporadically slowly since Yosemite. Resetting the PRAM and SMC helped, and I believe El Capitan has made an improvement, as has Parallels 11. It's running reasonably well now for a six-year-old computer, I've just been obsessed with optimizing it and couldn't understand why it would be so far below the benchmark, so I feel better knowing it's as expected. Thanks again!

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