Posts Tagged ‘Yosemite’

OSX Yosemite slowdown fix

Posted: January 5, 2015 in Apple
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Yosemite’s UI slowdown seems partly due to too many interrputs coming from ACPI kernel driver.

sudo powermetrics -s interrupts

These news were reported by VMWare and Parallels :

https://communities.vmware.com/message/2440081

http://kb.parallels.com/en/122767

It seems running OSX in debug mode (does not have any hit on performance) allows retrieving some speed (despite not at a Mavericks level) :

sudo nvram boot-args=”debug=0x10″

Also OSX Lion leaded to slow UI performance (same 10 times slower than previous Snow Leopard), that was fixed  by Mountain Lion. We wonder then whether we will have to wait for OSX 10.11 to retrieve acceptable performance or Apple is preparing a fix for next Yosemite update.

Update : there weren’t many interrupts per second (1 to 20) on mac mini (mid-2010) and adding the boot args didn’t helped (only 10 percent performance more in Quartz and OpenGL, no improvement in UI speed results). To remove the boot options, use this command :

sudo nvram boot-args=””

http://www.cnet.com/news/boot-argument-options-in-os-x/

After removing these options some of the slight improvements were still present, however I ended with installing Mavericks back on another drive (as its UI is 10 times faster and OpenGL is 50 percent faster – I also now play games under Windows 7 through Bootcamp).

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Yosemite / mac mini

Posted: October 22, 2014 in Apple
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OSX Yosemite performance on a mid-2010 mac mini (NVidia 320M) reminds first 10.0 version : text rendering is 3 times slower (slow redraw when resizing windows), OpenGL is 2 times slower, and user interface test is 10 times slower ! Also opening windows (files listing) is slower, while the new UI theme shouldn’t require more power (it should be faster as it is simplistic – Googlish / Windowish -, without all previous refinements that ultimately landed into Mavericks, not mentioning still non fixed firewire disks sleep issue and trim issue).

Then Apple may use some new OpenGL 4 only APIs for Quartz, while older macs only support OpenGL 3.3.

The new mac mini have half the CPU cores than previous ones, do not allow adding RAM, and only provide an Iris graphics chipset (Iris Pro would have been at least required). Also new imac’s Nvidia 750M graphics card is old.

We now then have to either buy a retina imac ($2500) or mac pro ($2999), or wait for upcoming Broadwell based hackintosh (that will offer same performance for half power requirements, and then will allow smaller enclosure). Also Intel will release an updated Iris Pro.

We then want Scott Forstall (OS features and design), Jon Rubinstein (hardware leading edge with custom processors – should come with A8x) and Bertrand Serlet (Snow Leopard) back, as new team really isn’t talented (except iPad/iPhone hardware engineering).