1. Diablo 3 Only Shows your Mainhand Aps
If the hero is a dual-wielding Barbarian, Monk or Demon Hunter, the final Aps used for damage calculation is an overall (not directly averaged) Aps of both weapons.
Diablo 3 only shows the Aps for your mainhand weapon.
For example, the following monk uses a 1.30 Aps axe and a 1.54 Aps fist weapon. With attack speed bonuses from armors and dual-wielding (15%), the final Aps for the two weapons are 1.70 and 2.02.
Diablo 3 Tracker shows the overall Aps (not just averaged) - 1.85 and also each weapon's final Aps.
However, when you are in Diablo 3 game, it only shows the current mainhand Aps.
2. Enchantress's Focused Mind
When Enchantress the follower is hired and "Focused Mind" skill is selected, the skill will give you
- A 40 yard aura that increases attack speed for you and the Enchantress by 3%.
This 3% bonus from "Focus Mind", unlike "Attack Speed Increased by x%" from your armors, is applied to your base weapon speed directly, which is generally better than a "Attack Speed Increased by 3%" bonus from your armor.
You can enable the "Focus Mind" through the skill bar and see the effect. Use the previous monk as an example. With "Focused Mind", it looks as follows.
3. Active Skill and "Real-time" Passive Skill Bonus
Similar to Dps, Aps can be benefited from skills in real time. For example, there's a monk in the team with the following skill activated.
- Mantra of Retribution with Transgression - Increases attack speed for you and your allies by 8%.