Settings aren't taking

I’ve been recommended this plugin as it is supposedly fast. However, the settings don’t work: I can’t get the category into the title tag and while I choose to have no keywords (useless for any purposes), I still get a keywords tag in my blog.

I use Thesis theme and have turned off legacy support.

http://ww.wp.xz.cn/extend/plugins/gregs-high-performance-seo/