OS X Bottlenecks and Caching

Although the performance of OS X on the dual 2GHz G5 system that I'd been running was definitely acceptable, there is definitely room for improvement. The overall responsiveness of the system was decent, but go back to using a top-of-the-line PC in Windows for a few minutes, and you definitely feel a bit sluggish on the G5. I would say honestly that a 3GHz G5 would be a good speed to have; although, I have yet to try out the new 2.5GHz G5s to see how much things have improved with a 25% increase in clock speed.

I've already mentioned video memory as being a bottleneck under OS X, thanks to the OpenGL accelerated UI. But luckily, with a more expensive video card (note: it's a shame that even a $3000 G5 comes with a measly ATI Radeon 9600 - shame on you Apple), that problem can be resolved; although, only through the expenditure of more money. There are, however, other performance related issues to which I have not been able to find solutions, even through faster hardware, which is definitely disappointing. The biggest issue seems to be scroll speed under OS X. Scrolling through any sort of window is much faster under Windows than it is under OS X. Take a browser window for example. If there's any flash running on the page and you try to scroll, you'll be greeted with a decently fast, but stuttering, scroll. It's almost as if saran wrap is behind each and every Finder window just to make things interesting. Regardless of what causes it, it's annoying - but thanks to how nice and polished the rest of OS X is, it's something that can be ignored. It does get frustrating at times, but it's one of those things that I'm able to live with, surprisingly. I think that I'm beginning to understand much of Apple's user base.

Performance isn't always a negative thing under OS X. In fact, there is one aspect of OS X's performance that I do believe significantly outshines that of even Windows XP: caching. The biggest pet peeve of mine as a PC user is hearing that hard drive crunch and having it be the reason for an interruption in my work, play or whatever else that I may be using my PC for at the time. I always get the upgrade-bug just as soon as I hear that drive crunch away, and immediately, I want to upgrade any and everything in my system to make those few seconds that feel like an eternity cease once and for all. Of course, regardless of how much I throw at the problem, it's always there and although I can lessen it, I cannot rid myself of it.

What I found in my time with the G5 and OS X was that it does a marvelous job of caching, to the point where after the first time I start the machine, I rarely hear the hard drive being accessed. Furthermore, I definitely don't feel as slowed down by it as I do under Windows. Again, I feel a bit lost writing this without a complete understanding of how Apple architected the caching system of OS X, but the results are positive and noticeable.

The obvious requirement for any OS that caches heavily is a lot of memory; while my system shipped with 512MB of memory, I quickly found the need to upgrade to more. At first, it was 2GB, then 4GB and I even contemplated going up to the 8GB limit; although, with 4GB, I definitely have memory to spare. What I found, however, was that unlike under Windows, the extra memory actually did something under OS X. The more room it had to cache, the more it spread its wings and the better it did. Obviously, there are limitations. For me, beyond 2GB wasn't really necessary (I was mostly testing out a set of 1GB modules that OCZ had sent) and even up to 2GB, I could've probably been fine with somewhere between 1 - 1.5GB without a change in the feel of the system. With enough memory, the I/O bottleneck that I had been used to dealing with for so long isn't gone, but significantly lessened on the Mac. This doesn't apply if you're doing anything I/O intensive, such as running a file server, database (to an extent) or video editing, but for a user like me, the difference is significant - and appreciated. In fact, I'd say that this is one of the things that kept me happy with the system for so long.

What you want is what you get Stability
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  • vladik007 - Thursday, March 31, 2005 - link

    " highly paid Windows admin / Cisco Engineer "

    geeez ... new low bottom.
  • MarshallG - Monday, February 28, 2005 - link

    I was thinking about getting a Mini Mac. But with a 1.25 GHz CPU, it's about 1/4 the machine that Anand tested.

    Will I be disapointed by its performance at the same kinds of tasks Anand mentioned? I realize that I'll have to upgrade to maybe 1 GB of RAM.
  • BikeMike - Sunday, January 30, 2005 - link

    re: OSX dialogue keyboard shortcuts - like in Word, where 'd' means 'don't save' and 'return' & 'enter' apply to the highlighted button, many OSX apps do not require a modifier key, such as 'alt' or 'command'. The experience of discovery is guesswork, yes, but if you don't look for a modifier key, you get better at guessing. For example, in iTunes dialogues, 'y' means, you guessed it, 'yes'.
  • pyramiddown - Saturday, January 29, 2005 - link

    Ctrl-Tab to switch tabs in Firefox
  • OmnisAudis - Wednesday, January 26, 2005 - link

    Great article! very long winded, but awesome. I am a long time Mac user, with an XP machine at home and an iBook at work.

    I thought it was very interesting you found nothing snazzy about iCal. It is my FAV Apple app!! It is the most powerful, easy to use calendar I've come across. And it seems to be able to do things that XP Outlook can't. For one thing, I can publish a calendar so that other users can subsribe to it. When I make a change to that calendar, they see those changes.

    I can have TONS of calendars. In outlook, my boss can only have one (and view others). At my work place, we have 20 productions going on. It would be great if he could generate a calander that we could subscribe to for each show. As changes occur, we would get them without a memo going out, and everyone updating their calendars.

    Plus, I can subscribe to a season calendar of the Yankees! So as I publish calendars for visiting artists, and I subscribe to one for entertainment.

    I'll stop now. But I think you should revist iCal. Look at it from a multi-user point of view.

    Thanks for the objective article. I've learned a few things about OS-X!
  • KingKuei - Sunday, January 16, 2005 - link

    Anand,

    Wait til you see Tiger...

    Updated Safari with significantly improved speed and capabilities.

    Add the Spotlight feature (comprehensive demo at MacWorld Expo --> don't miss the jab at Bill Gates when the Spotlight feature crashes... one word: backup)

    Dashboard (sorry to the company that made it, but the feature is coming free to Tiger and I can't wait!)

    And for the first time, fully takes advantage of the 64-bit processing core of the G5.

    Anand, I dare you to write a follow-up review on that dual-2Ghz of your's when Tiger ships ON SCHEDULE later this year!
  • macgeek - Saturday, January 1, 2005 - link

    It is go glaringly obvious to any Mac user that you did understand half of what you were writing about. Just a few glaring omissions from your article:

    * Unix-based, and you have full control of Unix through the terminal.

    * No spyware or viruses - I don't even run anti-virus because there has NEVER been a virus for OS X. NOT ONE!!!

    * Why do you think Office 2004 sucks? Probably because it's made by Microsoft! Ever heard of OpenOffice?

    * Address Book - not only is it integrated into mail, but it's integrated into OS X.

    * Guess you didn't spend much time looking for it, because you could have had Trillian for Mac OS X as well.

    * Browsers - Yeah, Safari needs some work, but you've got quite a few to choose from. Oh, and Safari isn't the Lincoln Tunnel of security holes that IE is either. And if you so choose, you can simply drag Safari to the trash can and never use it again. Now try that with IE.

    * ipfw vs. Windows Firewall - Puuhhlleeeeasseee!! What does microsoft give you? A firewall that a third-grader could get through and that allows EVERYTHING OUT!!!!! I quite like having the ability to customize ipfw in terminal to have a firewall that is truly an industrial strength firewall.

    * Root authentication - whenever a program needs to install or modify system files, you have to authenticate as root. Too bad that when you're logged on as an Admin in Windows it's "anything goes" and you have no choice when that nasty website throws a dll file into the Windows directory.

    * No mention of any Apple Pro Apps like Final Cut HD. I've seen what happens to P4 systems when they try to render video in Adobe Premiere - they crash. You have to drop at least an extra $1000 for a Canopus or high-end Matrox capture card to have a chance of competing with a dual G5 system. My PowerBook G4 1.5 GHz renders video better than my P4 3.4 with 1GB of HyperX PC3500.

    * No mention of integrated Bluetooth, or how simple it is to configure networking, or of integrated Firewire 800.

    Shoddy research, and a poor attempt overall. It's easy to see that you liked the G5, but you didn't even scratch the surface before you wrote that article. And if you honestly think that OS X crashes as much as Windows, you REALLY must not have known what you were doing.

    And I qualify this as my day job is as a highly paid Windows admin / Cisco Engineer. I know Windows XP / 2k / 2k Server and Win2k3 inside and out, and they can't touch the possibilities of OS X. The only area that I'll give you is gaming. That's why I have a top-o-the-line AMD.
  • hopejr - Monday, November 8, 2004 - link

    I'm quite impressed with this article. I'm a recent switcher (august 04) and can say that I much rather OS X to any other OS that I've used (every single released version of windows from 1.03 to Longhorn 4074, many Linux distros, and mac os from system 6 to OS X Panther).
    I didn't go for a beefed up PowerMac G5, but I did buy a 12" iBook G4 with student discount (April 04 model). I've found that these are the cheapest decent notebooks out (as I can't stand celerons :P), and for a 12" at just AU$1520, I think it was a bargain (most PC 12" laptops are twice that much with almost identical specs).
    I also like the fact that I have seemless networking with my Windows machines. Another thing I like is that I can do all the stuff I need to do on linux (for University) on my iBook because of its unix base.
    In regard to the point someone made (i can't remember which post) about this article testing multitasking on a dual processor environment, I find that my single processor G4 laptop is still much better at multitasking than the latest Windows PC with hyperthreading, or even an AMD64, that I've used. Maybe that's just me though :P.
    I've found that I'm more productive on OS X compared to windows, especially with all those keyboard shortcuts.
    BTW, post #207 is right about the choice mac users have to make, I make those choices now, and know exactly when I want a program to close, or when I just want to close a window. I also find command-H and command-option-H very useful with reducing screen clutter.
    I haven't always liked Macs. I hated them mainly because the classic OS was a pain to use in my opinion with little control over it (I am a DOS user, so I like being in control of my machine using a command prompt). When OS X came out (especially Panther), my hatred disappeared.
  • macgruder - Saturday, November 6, 2004 - link

    Pretty good and fair review.

    I wish people would stop saying an App should quit when you close the last window. This is not useful in many situations. e.g. I'm in Photoshop, I have a window open, and I'm done with it, but am going to continue working. Close the windows, oops Photoshop quits.

    Mac users are used to making the following choice:
    a. I want to close a window (command-W)
    b. I want to quit the App. (command-Q)

    These are 2 distinct actions. To me closing a window is just that, and shouldn't be connected to the independent action of quitting an app. If I'm done and I have ten windows open, I just command-Q, and the windows(if not saved) close automatically anyway. As far as I can see Windows seems to be forcing you (correct me if I'm wrong) to do an unconnected action, when you may not want to.
  • Humancodex - Friday, November 5, 2004 - link

    I make a link of the article to: http://www.macbidouille.com (french) in forum "switch", everybody like your "objectivité", and like you to push the Mac test trial more often!

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