Meta keywords character number of mz-es.de web site is 399 character. It can be say that meta keywords section character number is rather too many. Many search engines suggest to not get over 200 character for meta keywords section in their article and optimization criterias explanations. According to the paralante crew's experience , meta keywords performance more than 200 characters drop the optimization quality and search engines give penalty to the internet sites. If search engines spiders didn't give you penalty as such, It can be say that you are lucky. You should drop promptly to the 200 characters.