How can it slow your site down? You don't install any script or anything. The only thing you need to do is add a verification meta in your html.
yep I totally agree with JohnSON by adding just a meta tag line dosent effect anything your file will only increase at max 200 bytes which is 1/5 of 1kb!
Are you on about analytics, as lilac2 says, or the googlebot? Either way, I've never had a problem with either
Google webmaster tools theoretically can't slow down your site if you use a HTML to verify your site. If you use a metatag then theoretically is can slow down your website. But this will not be noticed. If you are talking about Google Analytics, yes theoretically it will slow down your site, but again, no one that will notice. So I would say it's a big rumor.
No way! How will it slowdown your site when you don't add anything to your site? (except the verification code...)
From where u find this "Google webmaster tools can slow down your site server speed." Google Webmaster Tool is really helpful for every website.
I think it is impossible for small sites. But I do not know whether it affect a large site like dp? I do hope it is only a rumor and not true. When G find many BLs for your site and check your verification code next step Will G recheck your site to find your site existed or not?
I doubt this is true. I guess the biggest issue with the web sites being slow is overly bulky/unoptimized html/php code and crappy hosting.
I think webmaster tools has nothing to do with site loading speed. Webmaster tools do not slow down sites
I don;t think it will slow down your site, because it get data from google own database, and googlebot claw your site anyway with or without webmaster tool
Unless Googlebot crawls your site more often when webmaster tools is running - I can't think of another reason
I don't think so we don't have to add any script or anything which can cause any problem while uploading . Its one of the best rumour .