Slowing Ad Delivery threshold

[Tiber]

I started into AdWords about a week ago and have been getting decent results. However, about every two days my ad deliverly seems to get slowed from some "underperforming" keywords. After the second time this happened I went through and deleted any keywords with a lot of impressions but few or no clicks. Tonight I received another slowing.

My question is, what is the threshold where a keyword gets slowed so I can prevent this from happening all the time? Is it a certain CTR after a certain amount of impressions? For example, say a keyword "red beautiful widgets" has recieved 400 impressions and 1 click. Is it in danger of slowing down my ads? Suppose "blue beautiful widgets" has 200 impressions and 0 clicks. Will that cause the ads to slow?

How does one determine when to get rid of a keyword, and additionally, how am I supposed to know exactly which keyword(s) are slowing the account?

Edit: I do know about the Keyword Reports where I can monitor the performance of the keywords in my campaigns. I'm just trying to find out when "exactly" poorly performing keywords trigger the ad slowing.

Thanks

[AdWordsAdvisor]

...I'm just trying to find out when "exactly" poorly performing keywords trigger the ad slowing.

Welcome to WebmasterWorld, Tiber! I hope the following information will prove to be useful.

Quoting from the Glossary in the Help Center (Bolding mine):

The AdWords system slows ad delivery for your in-trial keywords if many of your keywords consistently fall below the minimum required clickthrough rate (CTR) of 0.5%. Slowing affects only in-trial keywords; keywords marked 'normal' will continue to experience regular ad delivery based on your current budget settings.

For lots more info, please see the following pages from the AdWords Help Center:

General search on 'account slowed'.
[adwords.google.com...]

Why has my account been slowed? What do I need to do?
[adwords.google.com...]

AWA

[Tiber]

Thank you AWA. That clears it up for me. As long as a keyword is "normal" there is no danger of it slowing the ads. I deleted a few "normal" keywords over the last day or two with rather high impressions and low clicks. I guess I can put them back and more closely monitor the in trial keywords.

Thanks again.