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I am having a very difficult time with SEO by Yoast regarding duplicate title tags. I was also having duplicate page content because of all the cateories I have with my client's menu items and it wasn't apparent that SEO Yoast had an on off switch for robots meta tags for anything else than posts and pages, not categories.  (Am I missing something here?) So I went the a la carte method and used two plugins that I have had good luck with, "Page Meta" that takes care of posts, pages and categories title and meta descp and "Robots Meta"  to make the categories no-follow.   I do love SEO by Yoast for the Page Analysis tool that is really fast for on page seo.  Any thoughts as to this approach?  I wonder about slowing down my site's speed with this approach.