This website is using a robots.txt file.

This website has a sitemap file.

Your webpage has 15 'img' tags and 1 of them are missing the required 'alt' attribute.

Congratulations! Your page does not use HTML deprecated tags.

Congratulations! There are no severe JavaScript errors on your web page.

Your page do not use any HTML compression!
You should compress your HTML to reduce your page size and page loading times - this will help your site retain visitors and increase page views. If you were using compression, you could be compressing your HTML size by 64 % - from 5.61 Kb to 1.99 Kb which would further reduce your page loading time.

Your site loading time is around 13.142 seconds and is over the average loading speed which is 5 seconds.

Your page has more than 20 http requests, which can slow down page loading. You can try reducing http requests through various methods such as using text instead of images, using css sprites, using data URIs instead of images, or combining several external files together into one.

Your site is not using expires headers for your images. An expires tag can help speed up the serving of your webpages for users that regularly visit your site and see the same images. Learn more about how to add expires headers to your images.

Congratulations! Your URL doesn't have any redirects (which could potentially cause site indexation issues and site loading delays).

http://www.slen.nl/home2.html and http://slen.nl/home2.html should resolve to the same URL, but currently do not.

We found 1 email addresses in your page code. We advise you to protect email links in a way that hides them from the spam harvesters.

Your website is not using media queries. You should consider using this technique in order to implement responsive design functionalities.

Your webpage doesn't take the advantages of HTML Microdata specifications in order to markup structured data. View Google's guide for getting started with microdata.

Your webpage does not use the noindex meta tag. This means that your webpage will be read and indexed by search engines.

Your page does not use the canonical link tag.

Your webpage does not use the nofollow meta tag. This means that search engines will crawl all links from your webpage.

Your robots.txt file disallow the search engines access to some parts of your website. You are advised to check carefully if the access to these resources or pages must be blocked.

Your DNS server is not using an SPF record. SPF (Sender Policy Framework) allows administrators to specify which hosts are allowed to send mail from a given domain by creating a specific SPF record or TXT record in the Domain Name System (DNS). You can find more information about SPF records here.