Why use sliders in adjustment HUD?

Monitoring this list, I've noticed a number of posters citing performance problems with the sliders in the adjustment HUD (jerky, slow, "totally unusable", etc.).
I'm curious why the sliders are being used at all? To me the sliders adjustments are far too coarse when compared to clicking on the arrows left and right of the numeric values, holding down the shift key when larger change increments are desired, or holding down the option key when smaller change increments are appropriate. Unless I'm missing something, adjusting "by the numbers" seems to give much finer control over adjustments AND more instantaneous screen feedback (i.e., performance) than using the sliders. The sliders, while visually attractive and intuitive, are the last method I'd consider for making adjustments to image tone, color, sharpness, etc. (Remember, digital photography at its core is all about the numbers.)
Here's an example: Say I have an image with a White Balance temperature of 5200 and, from examining the image and checking neutral values where available, I decide the image color cast needs to be a bit less red. I hold down the shift key and click the left arrow by the 5200 temp value. Each click results in a change of minus 100 in the temp value, and near instantaneous feedback on the image color change, even in full screen mode. Five quick clicks and the temperature is now at 4700, I'm satisfied with the color cast of the image and move on to the next adjustment or next image. If I use the sliders to make the same adjustment, I have to do a lot of back and forth mouse movements -- overshooting or undershooting until I achieve the temperature and color cast I am aiming for. That is a frustrating way to make color cast (or other) adjustments, even with something like the Levels or HSL tools in Photoshop. Worse, Aperture may be attempting to to process/redraw the image for every tiny increment of pointer movement, leading to increased load on the graphics processor and CPU.
Truly, I mean no offense to anyone on this list, but I do wonder if some of the frustrations with Aperture performance are related to which image adjusment mechanism is being used? As with Photoshop, there are multiple ways to accomplish the same objective in Aperture and it takes time to learn the nuances and benefits of each approach -- reading the manuals, experimenting, picking up forum tips, etc.
Again, I'm asking this question primarily to explore the root causes as to why some users, including myself, are quite satisfied with Aperture performance and others are totally dissatisfied. Could it be, in addition to hardware configuration differences (graphics cards and amount of memory being prime suspects), that there is also a usage pattern element to performance?
BTW, I'm working exclusively with 12.8 MP Canon 5D raw files for my newer images, 6.3 MP D60, 10D and 20D raw files for my older images. Don't know if there is also a platform difference in performance (e.g., Canon raw vs. Nikon nef)
Mike
PowerMac G5 Dual 2.0GHz, Radeon X800XT Graphics Card; MacBookPro 2.0Ghz   Mac OS X (10.4.6)   iMac800 and Powerbook G4 also in household

LE card, I can't tell whether all the behaviors I
am seeing are related to the card or not. And I
One is related to your card, the other weird behaviour (that after some time of work) isn't necessarily related to GPU performance. It seems to be related to something different, but what this might be no one on this forum seems to know.
underperformance. Sometimes, when using sliders, if
I click on the slider and wait about 2 seconds, and
then slide the slider, the slider moves sort of
normally, although it lags somewhat even then. But
That seems to be a 6600LE issue.
the second issue is that after I have been adjusting
a project of images for maybe 30-40 minutes, the
adjustments all start slowing down tremendously. For
Well, this issue seems to have been brought along by Aperture 1.1 and isn't video card related, at least people with 7800GT cards report it as well.
So, O.K., I bite. It's not Aperture, it's the video
card. Show me where I can buy a video card for less
than $800 to fit my PCI-E bus PowerMac.
Well, actually Aperture 1.1 might be the culprit for the second issue. It's a lot better than some people claim, but that doesn't mean, that there can't be bugs inside.
For the video card thing: http://strangedogs.proboards40.com/index.cgi
Look in the stuff for sale forum. Disclaimer: I am only a happy "customer" and have no further relations to these guys.
Bye,
Carsten

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