While typing with IntelliJ IDEA the identifier under the caret is highlight with a very ugly turquoise background. And all occurrences of identifier in a different shade of turquoise.

This can be helpfully. But not with that obtrusively ugly colour. And not right while I type. 

Is there any way to configure that pain to become useful? A different colour might be nice. Or 2 sec delay. Perfect would be both.

Or if this is not possible then I rather live without and would like to know how to switch it of completely.

Thanks for any hint.