As of my last knowledge update in September 2021, the fastest way to gain Slayer experience (XP) in Old School RuneScape (OSRS) can vary depending on your combat level, gear, and preferences. However, here are some general tips and methods that were effective at that time. Please keep in mind that the game may have been updated or changed since then, so it's a good idea to check for more recent guides or community discussions for the most up-to-date information.

1. Cannoning Tasks: Using a Dwarf Multicannon during Slayer tasks can greatly increase your XP rates. Tasks that are particularly good for cannoning include Dust Devils, Suqahs, and Dagannoths.

2. Block/Extend Tasks: Use the Slayer reward system to block tasks that you find slow or inefficient and extend tasks that are quick and provide good XP. Commonly extended tasks include Bloodvelds, Nechryaels, and Dust Devils.

3. Efficient Gear: Invest in gear that maximizes your damage output and defense. This may include high-level armor and weapons like the Abyssal Tentacle, Whip, and Barrows gear.

4. Special Attacks: Learn to use special attacks effectively. Weapons with special attacks can increase your damage output and make tasks go faster. For example, the Dragon Dagger's special attack can be used to quickly kill certain monsters.

5. Prayer: Use protection and overhead prayers where necessary to reduce damage taken. This can extend your task length and save on supplies.

6. Skip or Burst Tasks: Some tasks like Smoke Devils can be skipped if you find them too slow and not worth the time invested. Alternatively, you can use the Ice Burst or Ice Barrage spells to burst tasks like Dust Devils or Nechryaels, which can be incredibly fast but costly in terms of runes.

7. Efficient Task Order: Plan your Slayer task order efficiently. This can involve grouping tasks in a way that minimizes travel time between them or combining tasks where possible.

8. Bonus XP Events: Take advantage of in-game events or bonuses that offer extra Slayer XP. These events can significantly boost your XP rates for a limited time.

9. Experience Lamps: Use experience lamps or bonus XP rewards from other activities on Slayer if you're trying to level it quickly.

10. Wilderness Slayer: Some players choose to do Wilderness Slayer tasks, which can offer higher XP rates due to the increased risk and rewards. However, this is riskier as you may encounter player killers in the Wilderness.

Remember that Slayer XP rates can vary greatly depending on your level and gear, so what's most efficient for one player may not be the same for another. Always adapt your strategy to your own capabilities and preferences. Additionally, make sure to check for updates and changes to the game that may affect Slayer training methods since my last knowledge update in September 2021.

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