How to Stop Bad Bots Slowing Down Your Website
If your website is running slowly, bad bots could be to blame. Bots account for more than half of all internet traffic, and while some - like Googlebot - help your site get found in search results, others just waste resources. These so-called “bad bots” can eat up bandwidth, overload your server, and even cause security risks.
In this post, we’ll explain how to stop bad bots slowing down your website, why they’re a problem, and what you can do to block them.
Good Bots vs. Bad Bots: What’s the Difference?
Not all bots are bad. Search engines like Google and Bing use bots to crawl and index your site, helping potential customers find your business online. These bots follow the rules set in your robots.txt file and respect your website’s limits.
Bad bots, on the other hand, ignore these rules. They scrape your content, overload your database with requests, and slow down your website. If left unchecked, they can cause high CPU usage, increase hosting costs, and even make your site vulnerable to attacks.
Signs That Bad Bots Are Slowing Down Your Website
Wondering if bots are affecting your site speed? Here are some red flags:
- High server resource usage – If your hosting provider reports high CPU or bandwidth usage, bad bots could be the cause.
- Unusual traffic patterns – Sudden spikes in traffic from unknown sources could indicate bot activity.
- Slow loading times – If your website is sluggish despite being well-optimised, bots might be draining resources.
- Spammy referrer traffic – If you see strange domains in your analytics, bots may be crawling your site unnecessarily.
Common Bad Bots That Can Impact Your Website Speed
Some of the worst offenders include:
AhrefsBot & SemrushBot
SEO research tools that aggressively crawl sites.
BaiduSpider
A search engine bot from China that may not be relevant to your audience.
PetalBot
Another search engine crawler that can consume bandwidth without adding much value.
MegaIndex & DotBot
Bots used for link-building that can drain server resources.
Unknown Bots
Many bots disguise themselves as legitimate crawlers, making them harder to detect.
How to Block Bad Bots and Speed Up Your Website
If bad bots are slowing down your site, here’s how to stop them:
1. Use a Web Application Firewall (WAF)
A WAF, like Cloudflare or Sucuri, filters traffic before it reaches your server. It can block known bad bots automatically and protect against DDoS attacks.
2. Update Your robots.txt File
While bad bots don’t always follow the rules, adding disallow directives can reduce unnecessary crawling. For example:
User-agent: BadBot
Disallow: /
3. Use .htaccess or Server Rules
Blocking bots at the server level can prevent them from even reaching your website. You can add specific rules to deny access based on user agent or IP address.
4. Monitor Traffic Logs
Regularly check your website logs to spot unusual activity. If you see excessive requests from a particular bot, it’s worth blocking.
5. Choose Fully Managed Hosting
At CMS Live, we handle bot filtering as part of our managed hosting service. We monitor traffic, block harmful bots, and keep your site running fast and secure.
Keep Your Website Fast and Secure
Bad bots can slow down your website, increase costs, and cause security risks—but you don’t have to put up with them. By taking the right steps, you can block unwanted bot traffic and keep your website running smoothly.
Want to make sure your site is protected? Our managed hosting includes proactive bot monitoring and security measures, so you don’t have to worry about slow speeds or unwanted visitors. Get in touch today and let us take care of it for you!