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I make reasonably frequent use (several times/week) of Worldcat. Usually invoked via DuckDuckGo's "!worldcat" bang search, most often on an Android tablet.

Since Worldcat's recent site revision, that's resulted in frequent issues with pages failing to load and/or bot-detection messages which fail to clear or resolve, such that I abandon my search attempt.

The net effect is that Worldcat is far less useful to me than prior to the site revision.

Please tune any anti-bot features such that human users are not affected.

I'll often browse with both Javascript and cookies disabled and much prefer being able to do so for privacy and security reasons. As best as I can tell, Worldcat fails to function with either of these disabled. This also means that convenient tools I've created such as a command-line based Worldcat search using a console-mode Web browser utterly fail to function. This is a grave concern.

Please ensure basic search functionality of Worldcat without reliance on javascript or cookies.

I use a fairly atypical browser. Whether or not this tends to trigger bot detection I'm not sure, but I'll mention it. I'm not mentioning which browser, on the principle that Worldcat should be browser-agnostic. Please don't discriminate based on reasonably plausible user-agents.

Please use criteria other than user-agent in anti-abuse / anti-DOS features.

I'm utterly frustrated by the site changes, and am actively seeking out alternative library / book search options.

(A copy of an email support request sent to Worldcat.)