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Jon Peters has updated the community about how players aren't getting the correct rewards for dungeons:

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I just wanted to update everyone on where we stand with this. So far we have found a single bug with the system that is causing certain players to get stuck in a state of reduced rewards without actually exploiting. A fix for this has already been made and is being tested locally now. We are going to do more significant testing on this new version but we also believe it is more bulletproof to begin with. Please keep posting data as these cases are somewhat rare and are hard for us to find with internal testing but seem to be exposed quickly when thousands of people are playing thegw2 gold dungeons.

All rewards are susceptible to our code that is dealing with people who are speed clearing dungeons. This means that if you are speed clearing and then play some new chain for the first time it may not reward the full 60 tokens. If you find yourself getting less rewards consider whether or not your rate of dungeon completion is extremely high.

If you think you are running at a fairly reasonable pace post all of the chains you have run and the time of day they were completed and we will file it to try and figure out if it is a bug. Please post accurate times, otherwise we cannot determine if there are in fact bugs in the system. Please continue to use this thread as a place to post this data so that we have it all in one location.

Being efficient in dungeons means less reward? Here are the Q&A about this question, go and see other players' view about it:

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Stigma.7869: Would be more reasonable if Anet comes out and tells us the exact time we need to finish each dungeon in in order to get 100% of rewards if they are going to be like this.

At this point I rather them come out and say “You need to finish CoF in at most 30min or else you get 90% tokens!” Then i will just sit at the boss and not kill him for another 10min… with my team. IF that’s the stupid system that they want to go with give us transparency.

Robert Hrouda Content Designer:A bit of misinformation I am seeing in the threads is that if you complete a single dungeon in ten minutes, we’re going to punish you for it, as though we are punishing you for being “too good” at it. This is not true.

Our DR system combats repeated runs, and has a global presence as well effecting other dungeons. So if you run multiple 10 minute dungeons, back to back then you are going to get hit with the DR system no matter which paths you choose.

However the notion that your group will be punished for clearing any single dungeon in any amount of time is incorrect. Running through multiple speed clears back to back will result in the DR system influencing your rewards<gw2 gold>.

Mackdose.6504
Evil.9061:Robert Hrouda.1327:
but hitting different paths quickly won’t initially draw the influence of the DR system. .

“Running through multiple speed clears back to back will result in the DR system influencing your rewards.” -Robert H 9/26
Dont these directly contradict one another?

Only if you have poor reading comprehension.

Robert Hrouda Content Designer
ref.8196:
Well hold on here.

Nobody actually knows the amount of DR the system currently puts on the players. There is a bug at the moment which is screwing things up, so before you all start going in to a rant, lets just wait for the bug fix first?

Correct. People can speculate about the timing involved and how it works – we will not be divulging this information since it opens the system up to people finding ways around it. While we are confident in the system, we are doubly confident that people are amazing at finding holes in systems and breaking them.

The system is currently bugged, and is treating people unfairly. We’re actively working on it.