JS optimization breaks core block scripts
Combining or deferring JavaScript breaks WordPress core script modules, stalling blocks and forms.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 1 September 2026 · last reported 24 September 2026
What's going wrong
Owners of WordPress sites using Speed Optimizer report that combining or deferring JavaScript breaks scripts that WordPress core now loads as script modules.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.