I did enable speech recognition just in case, but very rarely use it, and I did not remember even accidentally activating it since bootup. Now I simply have a few apps running under Mavericks, and I noticed my fan spinning, so checked Activity Monitor and see that com.apple.SpeechRecognitionCore.speechrecognitiond takes up 986.1 MB of RAM.
What could this be?
I do use Chrome Canary, and I installed the Voice Search beta extension, but I don't think it is active now, and I haven't noticed the memory issue before.
By the way, Safari Web Content takes up another 738 MB, even though only a single tab of Gmail is open. What is this about, or how can I troubleshoot it?