You have probably heard both sides of this argument. Someone told you SSL slows your site down, and someone else told you that it is an outdated myth. 

Neither side usually shows you a number, which is exactly why you are still looking for an answer to: Does SSL slow down your website?

Here is the answer, backed by the actual data instead of opinions. 

SSL adds a genuinely tiny amount of processing overhead, and in most independent tests, sites using SSL load just as fast, or faster, than sites without it. 

The full picture explains both why the overhead exists and why it barely shows up in practice.

The Short Answer, With the Actual Numbers

When Google announced HTTPS as a ranking signal back in 2014, the company shared its own internal research on the performance cost.

 Google measured an average latency increase of just 0.1 seconds from adding encryption. 

That is one-tenth of one second, well below what a visitor could ever notice.

A separate study by HTTP Archive, which tracks performance data across millions of websites, found that HTTPS sites averaged a load time of 5.7 seconds, compared to 6.0 seconds for non-HTTPS sites. 

In that dataset, sites using SSL were not slower. They were measurably faster than their unencrypted counterparts.

Neither of these findings means SSL has zero cost.

 It means the cost is small enough that other factors, like server configuration and modern protocol support, end up carrying far more weight for your actual page speed.

It also helps to put that 0.1-second figure in context. 

Most performance guidelines consider anything under a quarter of a second to be effectively invisible to a visitor. 

Google’s own measured SSL overhead sits well under that threshold. 

This is part of why so much of the online debate about this topic has stayed anecdotal rather than data-driven.

Where the Small Overhead Actually Comes From

SSL does add processing work, and knowing where that work happens clears up most of the confusion. 

Every time a browser connects to your server over HTTPS, the two sides perform a handshake. 

This quick exchange verifies your certificate and agrees on an encryption method before any page content loads.

That handshake, along with the ongoing encryption and decryption of data during the visit, consumes CPU cycles, memory, and a small amount of network bandwidth. 

Measured directly, SSL and TLS processing typically uses less than 1 percent of CPU load, under 10KB of memory per connection, and less than 2 percent of network overhead.

On any modern server, this is a rounding error compared to the resources used to generate and serve your actual page content.

Older hardware, outdated TLS versions, and misconfigured servers can push that overhead higher. 

But that is a configuration problem, not a fundamental limitation of SSL itself.

A properly set up certificate on reasonably modern infrastructure will not create a noticeable slowdown for your visitors.

It helps to picture what that handshake involves. 

Your browser and the server exchange a small set of messages confirming the certificate is valid. 

Agreeing on a shared encryption key, all before a single byte of your webpage has been sent. 

This entire exchange typically completes in milliseconds, which is why the measured impact on page load times stays so small even though the process itself sounds involved.

Why HTTPS Sites Often Load Faster in Practice

The more interesting part of this story is why encrypted sites frequently outperform unencrypted ones. 

The explanation comes down to a technical requirement most site owners never think about: 

HTTP/2 and HTTP/3, the modern protocols responsible for major speed gains across the web, only work over HTTPS.

HTTP/2 introduced multiplexing. 

This lets a browser request multiple files from your server over a single connection instead of waiting for each request to finish before starting the next. 

It also compresses request and response headers, shaving hundreds of bytes off every single transfer. 

Server push, another HTTP/2 feature, lets your server send resources to a browser before they are even requested, cutting down on the round-trip entirely.

Consider a typical page loading a stylesheet, several images, and a couple of scripts. 

Under the older HTTP/1.1 protocol, the browser opens a limited number of connections and queues the rest of those requests behind them. 

Under HTTP/2, all of those files can travel over the same connection at once.

It is why sites that upgrade to HTTPS and HTTP/2 together often see a more noticeable speed improvement than the SSL overhead alone would suggest.

None of those gains are available to a site still running on HTTP. 

So when a study finds HTTPS sites loading faster on average. 

Part of what it is really measuring is the benefit of HTTP/2 and HTTP/3, protocols that SSL happens to be the ticket into.

TLS 1.3, the current standard encryption protocol, adds its own improvements on top of this. 

Where older TLS versions needed two full round-trips to complete a handshake, TLS 1.3 typically needs just one. 

Returning visitors can benefit from session resumption, sometimes called zero round-trip time resumption.

It lets a browser reconnect almost instantly using a remembered key from a previous visit rather than repeating the full handshake.

Metric	Non-HTTPS Site	HTTPS Site
Average load time (HTTP Archive study)	6.0 seconds	5.7 seconds
Average latency added by encryption (Google’s own data)	Not applicable	Roughly 0.1 seconds
Access to HTTP/2 and HTTP/3 protocols	No	Yes
TLS handshake round trips (TLS 1.3, first visit)	Not applicable	1 round trip
Handshake on repeat visits with session resumption	Not applicable	Near-instant

The Honest Caveat: Correlation Versus Causation

It is worth being direct about a limitation in this data.

Websites using HTTPS today are also more likely to run on modern hosting, use a CDN, and have caching properly configured. 

This is simply because these all tend to arrive together as part of a reasonably current setup.

That makes it difficult to isolate the speed benefit of SSL alone from the speed benefit of everything else that tends to come bundled with it.

Think of it this way. A site owner who set up SSL last year is also statistically more likely to have set up a CDN, enabled caching, and optimized images around the same time. 

It is simply because these tend to happen during the same round of site improvements. 

None of the studies cited here fully separates those variables, which is a fair criticism of this kind of research in general.

What the data does support clearly is this: no credible, large-scale study shows SSL dragging site speed down in any way a visitor would notice. 

Whether the modest gain some studies show comes purely from HTTP/2 access or partly from correlated infrastructure improvements, the conclusion for you stays the same. 

Adding SSL to your site will not meaningfully slow it down, and it very likely nudges you toward measurable improvements instead.

What Actually Slows Sites Down Instead

If your site feels slow, SSL is rarely the cause, even when it gets blamed first. A handful of far more common culprits get mistaken for SSL problems.

Running an outdated TLS version is one

Older protocols like TLS 1.0 and 1.1 require more round-trips and weaker, slower cipher configurations, and some hosts still default to them on legacy plans. 

Upgrading to TLS 1.3 alone can meaningfully cut handshake time without touching anything else on your site.

Missing HTTP/2 support is another

A site can technically have SSL installed and still be missing out on the protocol upgrade that makes SSL worth having from a speed perspective. 

Checking whether your host has HTTP/2 enabled takes a few minutes and can matter more than any other single setting covered here. 

Most modern hosting control panels list this under server or performance settings, sometimes labeled simply as protocol version.

Underpowered hosting is the third, and probably the most common

On a cheap, oversold shared server already struggling under load. 

Any additional processing, SSL included, becomes more noticeable simply because there is less headroom to absorb it. 

The fix there is upgrading your hosting resources, not removing your certificate.

This is worth restating plainly, because it is the single most common mix-up in this entire debate. 

A slow site with SSL installed is usually just a slow site, one that would have been equally slow, or slower, without the certificate. 

Removing SSL to chase a speed fix addresses the wrong variable and leaves you with a less secure site that is still just as slow.

Large, unoptimized images, unminified JavaScript, and slow database queries dwarf SSL’s impact on page speed in almost every case worth measuring. 

If your site is slow, these are the places worth checking first, long before SSL enters the conversation.

How to Get the Speed Benefit, Not Just the Certificate

Installing any SSL certificate gives you the security and trust benefits. 

Getting the speed advantage, too, depends on the setup behind it, which is where the provider you choose starts to matter.

Truehost issues SSL certificates for the Kenyan market on infrastructure already configured for TLS 1.3 and HTTP/2. 

So you get the protocol-level speed benefits covered in this guide by default, not as something you have to configure separately. 

A Domain Validated certificate starts from KSh 750 a year, with installation handled for you rather than left as a manual server task.

Every certificate includes 256-bit SHA-2 encryption and a 7-day money-back guarantee. 

Support is available directly if your setup needs anything beyond a standard installation.

If your business needs organization-level verification for added trust, Sectigo InstantSSL is available through Truehost from KSh 4,968 a year, with the same modern protocol support underneath it.

Wildcard certificates are also available if your site spans multiple subdomains, starting from around KSh 1,000 a year. 

So the same protocol-level speed benefits extend across your entire domain rather than just the main site.

This distinction is worth more than the certificate price tag alone suggests. 

Two sites can install the same type of certificate and see different speed outcomes purely based on whether the server behind it supports modern TLS and HTTP/2 correctly. 

Choosing hosting where that is handled properly from the start is what delivers the speed benefit this guide has been describing.

Stop Guessing and Install SSL With the Speed Benefits Built In

The myth that SSL slows down websites has outlived the data that might have once supported it. 

Every major study on these points is in the same direction. 

The sites still worrying about it are usually the ones missing the protocol upgrades that come bundled with modern SSL, not suffering from SSL itself.

If you take one thing from this guide, let it be this: stop treating your certificate as a suspect the next time your site feels slow. 

Check your TLS version, confirm HTTP/2 is active, and look at your images and scripts first. 

That order will find the actual bottleneck far faster than removing encryption ever would.

Every day your site runs without SSL, you are also missing out on the HTTP/2 speed gains. 

The trust signals, and the search ranking benefit that come with it, while visitors on other sites enjoy all three. 

Get your SSL certificate through Truehost and get the encryption, the speed, and the modern protocol support in one setup, without the guesswork.