Linda,
The clicking noises sounds like FXI Camelback, which is the only indicator which has a sound alert turned on by default.
If you have that on your chart, you can disable the sound alert by changing the SoundAlert setting in the inputs menu for that indicator.
FXI Moving Average also has a sound alert, but the latest version has it disabled by default. If you have an older version, it might be causing the clicking noise too.
As far as slowing down your charts - I would really need to know what indicators you have loaded. I have several of our custom indicators running constantly, on a PC that is turned on 24/7, and I do not notice any slowdowns.
Please let me know what indicators you are using. We'll get to the bottom of this