For me it works out to "way too fast at low levels, a bit too slow a high levels," so I would have to put it at overall a touch too fast.
Low level characters and the foes they encounter don't have a lot of options or hit points, so you can speed through encounters very quickly. I've never spent more than two game sessions at any of the lower levels (1st-3rd especially). I think this is too fast.
But at high levels, encounters often take longer and there are too many deaths to advance very fast. I've seen a character stuck at 13th-14th level for forty sessions or so because he would always die and lose a level. 3.5 made this worse by making true res cost so much. Even in 3.0, true res cost enough to make it only worth while ever now and again. I remember one fighter slowing losing the level battle in 3.0 and going down from 12th to 10th while the rest of the party went from 12th to 14th. Of course, 3.0's xp system made it impossible to catch up after level loss at higher levels. At least 3.5 fixes that. But still, the prevailenace of save or die at higher levels makes the level gain very slow.
At extremely high levels (17+) you have your own cleric use true res, and I suppose the game speeds up again. I haven't ever played at those levels, but I can see that it would happen.
Low level characters and the foes they encounter don't have a lot of options or hit points, so you can speed through encounters very quickly. I've never spent more than two game sessions at any of the lower levels (1st-3rd especially). I think this is too fast.
But at high levels, encounters often take longer and there are too many deaths to advance very fast. I've seen a character stuck at 13th-14th level for forty sessions or so because he would always die and lose a level. 3.5 made this worse by making true res cost so much. Even in 3.0, true res cost enough to make it only worth while ever now and again. I remember one fighter slowing losing the level battle in 3.0 and going down from 12th to 10th while the rest of the party went from 12th to 14th. Of course, 3.0's xp system made it impossible to catch up after level loss at higher levels. At least 3.5 fixes that. But still, the prevailenace of save or die at higher levels makes the level gain very slow.
At extremely high levels (17+) you have your own cleric use true res, and I suppose the game speeds up again. I haven't ever played at those levels, but I can see that it would happen.