WordPress 7.0 Delay Exposes Performance Problems Irish Developers Can't Ignore

Yesterday's announcement that WordPress 7.0 RC1 has been delayed from March 19th to March 24th sent ripples through Ireland's developer community, many of whom had March upgrade schedules planned around that original date. The delay isn't just about testing, it's about fundamental performance problems with Real Time Collaboration and Client-side Media optimisation that WordPress core contributors couldn't solve in time. For Irish developers, this delay reveals something more concerning: even WordPress itself struggles with performance at scale.

What Went Wrong: The Technical Reality Behind WordPress 7.0's Delay

According to the Make WordPress Core announcement by Amy Kamala, three critical issues forced the delay: Real Time Collaboration performance bottlenecks, Client-side Media optimisation failures, and bloated release package sizes.

The Real Time Collaboration feature, WordPress's answer to Google Docs-style editing, suffers from cache invalidation problems that effectively disable WordPress's persistent post query caches while a user has the editor open. That's a performance killer.

Client-side media processing proved even worse. Testing found JPEG processing takes around 19 seconds on an M4 Pro MacBook Pro. AVIF processing? Between 29 and 55 seconds. The feature has been pushed to WordPress 7.1.

These aren't minor bugs. They're architectural problems that reveal fundamental performance trade-offs WordPress core developers are still figuring out. For Irish developers managing client sites, this uncertainty should be alarming.

Real Time Collaboration Performance Issues: Why It Matters for Irish Agencies

Real Time Collaboration uses HTTP polling with CRDT update data stored in post_meta, creating performance bottlenecks with object caching systems. According to core contributor Peter Wilson's analysis, the feature generates roughly 480 requests per minute with just two collaborators, transferring around 900KB of traffic.

For a Dublin web agency working on a client site during business hours, that's a recipe for disaster. Your client's live site becomes sluggish while you're editing. Customer experience suffers. Page load times increase.

I recommended collaborative editing tools to a client in Cork three years ago. Their site became unusable during editing sessions. Took us weeks to identify the cause. Would not make that call again without proper performance isolation.

The architectural flaw is deeper than traffic volume. When collaboration is active, WordPress disables its most effective caching mechanisms to prevent data conflicts. Your site essentially runs uncached while anyone has the editor open.

Client-side Media Optimisation Problems and Their Impact on Core Web Vitals

WordPress 7.0's attempt at client-side media processing exposes why performance-critical tasks belong on the server. Processing a single JPEG client-side takes 19 seconds on professional hardware. Most Irish business owners aren't running M4 Pro MacBooks.

Only 44% of WordPress sites on mobile pass all three Core Web Vitals metrics, compared to Shopify at 65% and Wix above 60%. WordPress's performance gap is already significant. Client-side media processing would have made it worse.

The reality check: 43% of websites still fail the INP threshold of 200 milliseconds, making it the most commonly failed Core Web Vital in 2026. Adding 19-second media processing to the mix would push more WordPress sites into Google's penalty zone.

Who Needs This Most?

• eCommerce businesses: Client-side media processing during product uploads would kill your admin workflow. Uploading 20 product photos becomes a 10-minute task instead of 30 seconds.

• Content-heavy sites: Publishing a blog post with multiple images becomes an exercise in patience. Your content team will abandon WordPress for platforms that handle media processing properly.

• Agency workflows: Client handoffs become painful when basic media tasks take exponentially longer. Professional workflows require predictable performance.

What This Delay Means for Irish WordPress Upgrade Planning

Irish agencies planning March 2026 upgrades need to reconsider their timelines. WordPress 7.0's performance instability creates risk for client sites. The April 9th final release date aligns with WordCamp Asia 2026, but performance issues this close to release suggest fundamental problems remain unsolved.

The strategic question: do you upgrade clients to WordPress 7.0 immediately, or wait for the performance dust to settle? Early adopters face potential performance regressions. Late adopters miss new features and security improvements.

One limitation of this approach: waiting too long for upgrades creates security vulnerabilities. WordPress security updates typically target the latest major version first. The trade-off between stability and security requires careful consideration for each client site.

Link to staging environment testing guide becomes essential during major WordPress upgrades. Testing performance impact before deploying to production isn't optional, it's survival.

Performance Lessons Irish Developers Can Apply Right Now

WordPress 7.0's performance struggles offer three immediate lessons for Irish developers:

First, collaboration features require performance isolation. Real-time editing should never impact your live site's visitor experience. Use staging environments for collaborative work.

Second, media processing belongs on the server, not the client. Client-side processing creates unpredictable performance based on user hardware. Server-side processing with CDN delivery provides consistent experience.

Third, caching conflicts with real-time features create architectural trade-offs. WordPress's attempt to solve this at the core level failed. Professional hosting environments handle these conflicts better through infrastructure design.

The Dead Simple WordPress Performance Workflow

Step 1: Isolate. Test all WordPress updates, plugin changes, and new features in staging environments isolated from your production site.

Step 2: Monitor. Track Core Web Vitals performance before and after changes. Document performance regressions immediately.

Step 3: Optimise. Use server-side caching, CDN delivery, and database optimisation to handle WordPress's inherent performance limitations.

Step 4: Deploy. Only push changes to production after verifying performance impact in staging matches your requirements.

How Web60's Infrastructure Handles These Performance Challenges Today

Web60's managed WordPress hosting already addresses the performance issues WordPress 7.0 struggles with. Our Redis object caching system handles cache invalidation conflicts more elegantly than WordPress's core implementation.

While WordPress fumbles with client-side media processing, Web60's server-side optimisation with CDN delivery provides consistent performance regardless of user hardware. Your Dublin retailer gets the same fast image loading as your London customer.

Our one-click staging environments isolate collaborative work from production performance. When WordPress 7.0's Real Time Collaboration creates performance conflicts, your live site remains unaffected.

The performance monitoring built into Web60's infrastructure automation tracks the exact metrics WordPress 7.0 fails to optimise: cache hit ratios, database query performance, and Core Web Vitals scores. We identify performance regressions before your customers notice.

For Irish developers managing multiple client sites, this performance consistency matters. WordPress's core instability makes reliable hosting infrastructure essential, not optional. For further context, see AI-powered infrastructure that eliminates manual server management. For further context, see AI-powered WordPress infrastructure for Irish businesses.

Conclusion

WordPress 7.0's delay reveals fundamental performance challenges that even core WordPress developers struggle to solve. Real Time Collaboration cache conflicts and client-side media processing failures expose architectural limitations that impact every WordPress site. For Irish developers, this uncertainty makes professional hosting infrastructure more critical than ever. Web60's performance-optimised stack provides the stability WordPress core cannot guarantee. Try Web60's 60-second site builder and experience WordPress hosting that solves performance problems instead of creating them.

Sources

Make WordPress Core - WordPress 7.0 Release Candidate 1 Delayed (https://make.wordpress.org/core/2026/03/19/wordpress-7-0-release-candidate-1-delayed/)

The Repository - WordPress 7.0 RC1 Delayed to March 24 Over Real-Time Collaboration Concerns (https://www.therepository.email/wordpress-7-0-rc1-delayed-to-march-24-over-real-time-collaboration-client-side-media-and-package-size-concerns)

The Repository - WordPress 7.0's Real-Time Collaboration Performance Analysis (https://www.therepository.email/wordpress-7-0s-real-time-collaboration-heads-into-rc1-with-key-questions-still-open)

Core Web Vitals Technology Report - WordPress Performance Analysis (https://www.corewebvitals.io/core-web-vitals/wordpress-guide)

WordPress Developer News - What's New for Developers March 2026 (https://developer.wordpress.org/news/2026/03/whats-new-for-developers-march-2026/)