[JpMaxMan]

Changing a TrainingService's company and saving can leave the browser unresponsive even though the POST completes and the record is saved. The observed Company picker contains 4,732 options, which the legacy Chosen widget duplicates into result rows and rebuilds after AJAX form replacement.

Use SilverStripe's supported no-chzn opt-out for this Company field only. The browser renders a native select; the full company list, selected value, CompanyID field, required validation and existing save/authorization path are preserved. The tradeoff is losing Chosen's searchable dropdown.

This is a candidate mitigation for staging comparison, not a confirmed root-cause fix. Source review also identified uncancelled Chosen visibility retries and potentially expensive widget cleanup/layout during form replacement. No performance trace yet attributes the hang to any one of these paths.

Validation:

• Candidate PHP syntax check passes.
• Patch applies cleanly to reviewed source; current master (273d5a7) has the same original field implementation.
• No production record changes or deployment.
• Browser profiling remains pending: the local runtime blocked Chromium launch. Synthetic comparison harness is prepared locally; no timing results are claimed.

Before merging, compare baseline and native Company picker in isolated staging over repeated company-change/save cycles. Confirm persistence with a fresh form/database read, required-field validation, keyboard operation, and no accumulating detached widgets or timers. Record a trace before interacting/saving to distinguish JavaScript, layout and GC. If disabling Chosen does not resolve the stall, continue profiling rather than treating this as the fix.

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