Not that your pictures aren't great, they don't help us with the lag issue because you have not given any information that you haven't told us from earlier. Actually that is not true, you have said you are using low graphic settings.
Interesting that your main client is showing 999 FPS. This might be a calculation error, but it highlights that something is not correct.
But other than that:
What did you try from the How to tweak your framerate page?
Do you have multiple GPU's?
What are your computer specifications?
Can you provide a Diagnostic?
Did you try changing the CPU strategy?
Can you disable any Addons (except the ISBoxer addon)?
Are the WOW's using the same installation?
The password problem (a separate issue) is probably that you have KeyMaps enabled (the toggle button on the left with the green arrows on it). You can also disable them with SHIFT+ALT+M. The reason is detailed in the
Quick Start Guide in the
Logging to the game section
Key Maps default to being enabled. If you have any of the keys 1 through = in your password, you will need to temporarily disable Key Maps to enter it – that's because those are reconfigured to perform auto-assist.
Which means that if you don't disable keymaps, then along with the 1 to = you are trying to type, you will also get other values input into the password field, thus making your password incorrect.