TLS 1.2 vs TLS 1.3: does upgrading actually matter
TL;DR: TLS 1.3 reduces the handshake process (the negotiation that happens before any actual data is exchanged) from two round-trips to effectively one, directly cutting connection setup latency, particularly noticeable on higher-latency connections, and removes several older, cryptographically weaker cipher and key-exchange options that TLS 1.2 still permits, reducing the potential attack surface even when a server is properly, securely configured. The practical, felt difference for a typical visitor is real but modest for most sites, mostly showing up as a small connection-setup speed improvement rather than a dramatic, visible change, and upgrading is a reasonable, low-risk improvement worth making where your hosting environment supports it, rather than an urgent fix for an active, currently-experienced problem.
What TLS actually does, briefly
TLS (Transport Layer Security), the protocol underlying HTTPS, is responsible for establishing an encrypted, authenticated connection between a browser and a server before any actual page content is transmitted, involving a "handshake" process where both sides negotiate the specific encryption method to use and verify the server's identity via its SSL certificate, covered in our dedicated certificate types guide, before the actual encrypted data exchange, the page content itself, begins.
The handshake latency improvement
TLS 1.2's handshake process requires two full round-trips between browser and server before the encrypted connection is established and actual data can begin flowing, each round-trip incurring the network latency cost of a request traveling to the server and a response traveling back. TLS 1.3 redesigned this process to require effectively just one round-trip in the standard case, directly cutting the connection-establishment latency roughly in half, a genuine, measurable improvement that becomes proportionally more noticeable the higher the underlying network latency is, since each eliminated round-trip saves exactly that connection's specific latency cost, meaning a high-latency connection (a longer physical distance, a less optimal network path) benefits more in absolute terms than an already very low-latency connection where there is less latency to save in the first place.
Removed weak cryptographic options
Beyond the latency improvement, TLS 1.3 deliberately removed support for several older cipher suites and key-exchange methods known to have cryptographic weaknesses or that had become considered insufficiently secure by current standards, meaning a server correctly configured to use only TLS 1.3 cannot inadvertently be configured to fall back to one of these weaker options, a structural security improvement distinct from and in addition to the latency benefit, closing off certain categories of cryptographic downgrade or weakness that remain theoretically possible (though generally requiring specific misconfiguration) under TLS 1.2's broader, more permissive set of allowed options.
Where the improvement is most noticeable
The handshake latency improvement is most noticeable for visitors on higher-latency connections (a visitor physically distant from your server, or on a connection type with inherently higher latency, like certain mobile network conditions), and for scenarios involving many separate connection establishments (a page loading many resources from different origins, each requiring its own separate TLS handshake, though this specific scenario is also mitigated by HTTP/2 and HTTP/3's connection reuse capabilities, covered in our dedicated HTTP/2 vs HTTP/3 guide). For a visitor on a low-latency, nearby, well-connected network, the practical difference is smaller in absolute terms, though the underlying improvement and the additional cryptographic security benefit remain present regardless of the specific visitor's connection characteristics.
![Bar chart showing typical connection setup time under TLS 1.2 versus TLS 1.3 across varying network latency conditions, illustrating that the improvement scales with underlying network latency, more pronounced for higher-latency connections]/images/blog/tls-1-2-vs-tls-1-3-does-upgrading-matter/chart-1.webp)
Backward compatibility considerations
Enabling TLS 1.3 does not require disabling TLS 1.2 entirely, and a well-configured server typically supports both simultaneously, automatically negotiating TLS 1.3 with clients that support it while gracefully falling back to TLS 1.2 for any client that does not yet support the newer version, meaning enabling TLS 1.3 carries essentially no compatibility risk when configured this way, since it purely adds capability for supporting clients without removing anything for clients that still rely on TLS 1.2. TLS 1.0 and 1.1, considerably older and now widely considered deprecated with known weaknesses, are a genuinely different consideration, worth actively disabling if still enabled on your server regardless of TLS 1.3 adoption specifically, a separate, more urgent hardening step than the TLS 1.2-to-1.3 upgrade discussed here.
A comparison table
| Factor | TLS 1.2 | TLS 1.3 |
|---|---|---|
| Handshake round-trips | Two | Effectively one |
| Connection latency | Higher | Lower, particularly on high-latency connections |
| Weak/deprecated cipher options | Permitted (if misconfigured to allow) | Removed entirely |
| Browser/client support | Universal, well-established | Very broad on current browsers |
| Backward compatibility when both enabled | N/A | Fully compatible, automatic fallback for non-supporting clients |
How to check and upgrade
Checking which TLS version a specific connection is actually using is possible via browser developer tools (the Security tab in Chrome DevTools, for example, shows the negotiated protocol version for a given connection) or a dedicated SSL/TLS testing tool that reports on a domain's actual supported protocol versions directly. Enabling TLS 1.3 generally requires your web server software to support it (current versions of major web server software, including current LiteSpeed, Nginx, and Apache versions, generally do) and appropriate server configuration, something most managed hosting environments handle automatically as part of keeping server software current, though worth confirming directly with your specific hosting provider if uncertain.
FAQs
Do I need to do anything on my WordPress site itself to support TLS 1.3?
No, TLS version support is a server/web-server-level configuration matter, entirely independent of your WordPress application code or content, meaning no WordPress-specific changes are needed; it is purely a hosting/server configuration consideration.
Will enabling TLS 1.3 break access for visitors on older browsers?
No, provided TLS 1.2 remains enabled alongside TLS 1.3 (the standard, recommended configuration), visitors on older browsers or systems that do not support TLS 1.3 automatically and transparently use TLS 1.2 instead, with no broken access or visible disruption.
Does TLS 1.3 affect SEO?
Indirectly, to the extent the reduced connection latency contributes marginally to overall page load performance, which is one factor among the broader Core Web Vitals considerations covered in our dedicated guide, though this is a smaller, secondary factor rather than a significant, directly named ranking signal on its own.
Is TLS 1.3 more resistant to future cryptographic attacks than TLS 1.2?
By removing several older, weaker options and adopting more modern, currently well-regarded cryptographic approaches, TLS 1.3 is generally considered to have a stronger security posture against known attack categories compared to a TLS 1.2 configuration that has not been carefully, deliberately hardened to exclude its own weaker permitted options.
Should I disable TLS 1.2 entirely once TLS 1.3 is enabled?
Generally not recommended for most sites, since a meaningful, if shrinking, share of clients may still rely on TLS 1.2 exclusively, and disabling it entirely risks excluding those visitors; the standard, recommended approach is supporting both, with TLS 1.3 negotiated automatically for supporting clients.
How do I know if my current hosting already supports TLS 1.3?
Checking your site directly via a dedicated SSL/TLS testing tool, or browser developer tools as covered above, confirms your current actual configuration rather than assuming based on your hosting provider's general marketing claims about their infrastructure.
Is this upgrade something I need to actively request from my hosting provider, or does it happen automatically?
This varies by provider; many current, actively maintained hosting environments have already enabled TLS 1.3 as part of routine server software updates, though it is worth confirming directly with your specific provider if you have not verified your current configuration, rather than assuming it is automatically current without checking.
Conclusion
TLS 1.3 provides a genuine, measurable improvement over TLS 1.2, primarily through reduced handshake latency (particularly noticeable on higher-latency connections) and the removal of several older, weaker cryptographic options, a real security hardening benefit distinct from the latency improvement. The practical, felt difference for a typical visitor is modest but genuinely positive, and enabling TLS 1.3 alongside continued TLS 1.2 support carries essentially no compatibility risk, making this a reasonable, low-risk improvement worth confirming is in place on your hosting rather than an urgent fix for an active problem.
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