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If you are using Wordpress then try to install some lazy load plugins. Learn more about it.

Yeah I am in contact with a fb consultant now as well - I will let you know once I have a response

Thanks Dan, but I have registered the right URL (http). However today I have again 100% indexed from the submitted URLs (changed nothing). Really Crazy. Cheers, Heiko

Option A. I wont even worry about it after that. Your time is more important so putting it to work for the other more important parts of your SEO campaign is better. I would worry about/focus on the content of that category page instead.

I'm interested to know answer to this question too. I'm about to introduce a CDN as our company is a global one and i'm hoping a CDN would reduce the page load time and thus reduce the average load time GA reports.. Curious why GA is recording worse for you.

yes thank you guys, that's how I thought about it as well and just wanted to clarify

If you remove a URL and allow it to 404 you can either remove it in GWT as well, or wait for them to update it. I would remove it in GWT as well just to be sure. There is no difference whether you have the files on the server or not unless the redirect comes down someday for awhile (even for an hour), which could result in all of those pages being reindexed. Other potential issues are if you have the site available on another domain or sub-domain that points to the same folder, in which case your redirects might not work on the other domain, depending on how they were written. For these reasons, I would go ahead and remove the files from the server just to be safe. You can back them up somewhere local or at some point before the "Public HTML" folder on the server.

Yeah, practically every site out there gets those so I would look at the other reasons for the traffic drop. If it's really bothering you then just domain:askives.com each of those and submit them.