Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Upgrade the memory of your 2019 iMac up to 128GB
Handpicked deals...
$1299 $1169
SAVE $130

$380 $280
SAVE $100

$1798 $1598
SAVE $200

$3297 $2797
SAVE $500

$3397 $2797
SAVE $600

$150 $90
SAVE $60

$1398 $898
SAVE $500

$3698 $2998
SAVE $700

$2998 $2498
SAVE $500

$1999 $1588
SAVE $411

$1799 $1299
SAVE $500

$1999 $1199
SAVE $800

$2299 $1599
SAVE $700

$2399 $2049
SAVE $350

$2799 $2399
SAVE $400

$2799 $1899
SAVE $900

$1199 $898
SAVE $301

$1349 $1049
SAVE $300

$997 $897
SAVE $100

$2099 $1699
SAVE $400

$1999 $1369
SAVE $630

$1999 $1599
SAVE $400

$1999 $1588
SAVE $411

$1329 $929
SAVE $400

$4499 $3999
SAVE $500

$329 $329
SAVE $0

$1499 $999
SAVE $500

$1399 $1099
SAVE $300

$1499 $1299
SAVE $200

$2199 $1999
SAVE $200

$3399 $2199
SAVE $1200

$1279 $719
SAVE $560

Slow Memory Allocation / Warmup

Last updated 2011-01-27 - Send Feedback
Related: memory, optics, Photoshop, software

When I first tested Photoshop CS5 in March 2010, I was stunned to see how much slower it was than CS4.  Then I noticed a curious thing— running tests more than once showed far better results on subsequent runs.

diglloyd warmup scripts

That finding led me to document what I call the “Photoshop warm up bug”; whereby Photoshop CS5 suffers from inefficient memory allocation until “warmed up”.

I wrote a C++ test program to verify that memory allocation could be done in a few seconds, not the minute or so being taken by Photoshop CS5. (I am also a software developer, e.g., diglloydTools).

And then I set about to develop a javascript that forces the warm up to occur as efficiently as possible (users of my diglloydTools software can download the warmup scripts).

Don’t launch/quite/launch Photoshop

The graphs below show run time with and without “warmup”.    It makes a compelling case for avoiding a launch/quit cycle, and instead leaving Photoshop running without quitting so that memory remains allocated and ready to go within Photoshop.

Of course, whatever is causing this problem could be fixed by Adobe (or Apple) at some point. I do not have an explanation from Adobe as to the cause, but clearly it has to do with inefficient memory allocation.

Upgrade Your Mac Memory
At much lower cost than Apple, with more options.
Lloyd recommends 64GB for iMac or Mac Pro for photography/videography.

Startup issue only

The warmup issue is a one-time issue, not an ongoing problem; once Photoshop has allocated plenty of memory, subsequent work proceeds apace (e.g., work on a file, close it, open another file, no problem).

Results shown here are for the 3.33GHz 6-core for diglloydMedium.  The diglloydSpeed1 benchmark (not shown) shows very little effect (less than 2%), but that’s because it allocates much less memory.

The penalty worsens with larger files and 12 cores versus 6 cores.

Photoshop CS5 warm/cold performance with 6-core Mac Pro
Photoshop CS5 warm/cold performance with 12-core Mac Pro
View all handpicked deals...

Samsung 2TB T5 Portable Solid-State Drive (Black)
$380 $280
SAVE $100

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__