The ratio of front side width to rear sight notch width, relative to the distance between the two (sight radius), plays a major role in speed & accuracy.
The simple answer is that a narrower front post, wider rear notch, or both (
wider light bars on either side of the front post) will generally aid in speed while compromising precision. For most practical shooting applications, typical factory handgun sights are too heavily weighted towards the precision end of the spectrum.
The less simple answer:
Shooting fast is just as much about vision as recoil management. Your ability to track your front sight and read what it's telling you from moment to moment determines how quickly you can make your next shot and how close that shot will be to your intended aiming point. Having a more aggressive front:rear ratio ("bigger light bars") gives you a larger window through which to see your front sight, relatively speaking. That larger window (1) means you'll have less precision which for many people saves them time they'd otherwise spend lining everything up
perfectly, and (2) gives you a wider visible range within which your margin of error will exist. This, in turn, gives you a better ability both to judge whether a shot is on/off as well as understanding where the sights are when they're not where you want them to be.
As far as improving your front sight's visibility is concerned, I'd suggest you look at the
JohnO DIY High Visibility Front Sight treatment.
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