I just bought a Mac Mini (mid 2011) secondhand with the following specifications:
- 2,3 GHz Intel Core i5
- 8 GB 1067 MHz DDR3
- 512 GB SSD
- Intel HD Graphics 3000 512 MB
I used to have a iMac 2006 earlier, and to my surprise the Mini 2011 seems to be much, much slower. Notice the following observations:
- Playing mp4 movies in both QuickTime, VLC and in webpages in Safari works fine for some time, but after a while starts lagging.
- The machine gets extremely hot, at most CPU temperature 101 degrees according to my temperature utility. The iMac (and previous Minis) never got anywhere near as hot.
- Indicated CPU usage in Activity Monitor seems to increase proportionately with CPU temperature (and how long the machine has been on), but this is somewhat unsure.
- The process
VTDecoderXPCServicesometimes takes several hundred percent while playing video. But sometimes it takes nothing at all.
- Encoding PAL videos to mp4 with
ffmpeggoes extremely slow (around 1 second of footage per second, while for comparison my MacBook Air 2014 manages 5 seconds per second)
Apple said "80% of the times doing a full format and reinstall solves problems like this". The guy who sold me the thing said he already reinstalled it, but he may not have done a full format first.
Before I go through the trouble of formatting and reinstalling, does anyone have experiences and tips to share of similar situations?
- Is the Mini actually designed for and supposed to get so warm (100 degrees celsius)?
- Is the problem simply due to the CPU being a i5? Are i5's ridiculously much slower than i7's?
- Is a full and reinstall likely to fix the problem?
- Are there other causes and solutions I should fix? (Save hardware problems and repairs)
Notice that VLC is set to use hardware acceleration and QuickTime runs accelerated by default as far as I know, so the problem is probably not related to this.