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I don't think so it is badly impact for SEO. It is an external script loading async on your website but there is a thing which might be considered as bad.  Sometime users who reviewed on google has private profiles which makes their profile picture 404 not found in google reviews plugin. I have googled it but didn't find any solution. So, i have come up with the lazy load solution but that's not permalink. It is just delayed loading the images which render the page quickly. Without using the lazy load the 404 not found links might take extra seconds for requests.  I used this plugin on my website  http://t20slam.com to show the reviews on my event but removed it because of 404 images errors. Other than this i think it is ok.

hello don

donot disawow all your link except spammy link. it will cut your ranking in google.

Hello,

Recently We have a taken a project " http://customerconnect-services.com/ " and are responsible for the Digital Marketing for the website. FYI, we have been following the best On-Page SEO practices ever since we took the project: Performing Keyword Research, Finalizing the Keywords,Using those in the Page-Title, Meta-Descriptions, Heading Tags and of course in the Content as per MOZ suggestions & SEO standards. But, we are unable to rank in first page; all the considered keywords have a ranking of 51+ which is a serious matter of concern for us. We have also checked whether the Domain / URL has been blacklisted, but it's not (Not even by Google).

We are therefore unable to figure out what is going wrong even after following so many best practices to get the keywords a good ranking (1st & 2nd page of SERPs). Therefore I would like to request you to provide your expert opinions in this regard by checking what is it that we are not getting right.

The website is euro t20 slam  As this is a high-priority issue for us & the client is a prestigious one of course, please help.Looking forward to hearing from you at the earliest.