Optional frozen-content resizing for smoother dragging

[mwrshah]

Optional frozen-content resizing for smoother dragging

resizable.mp4

Content heavy panels can make resizing stutter because each move triggers browser layout and repainting.

Would you consider an optional Panel mode?

• freeze: keep content at its starting size while panel boundaries move; hide scrollbars during dragging and update on release.
• preview: move a divider indicator, then resize on release.

A local prototype on the existing Nested groups example delivers ~20 pointer updates/sec live vs ~60 with the new Freeze and Preview options—a 3× gain in pointer-update throughput. Conditions: Production build, 1,000 rows, Chrome 152 headless, 6× CPU throttling, five-second continuous drag. These are pointer updates, not FPS.

Comparisons against main branch found no meaningful default-live throughput regression in this fixture.

Would you be open to this change?

Suggested PR: #746.

[bvaughn]

This is an interesting suggestion. It’s probably going to take me a couple of days to get around to it but I’ll give your PR some thought soon

…

On Mon, Sep 14, 2026 at 6:55 PM Munawar Shah ***@***.***> wrote: *mwrshah* created an issue (bvaughn/react-resizable-panels#745) <#745> Optional frozen-content resizing for smoother dragging Heavy tables and dense content can make resizing stutter because each move triggers browser layout and repainting. Would you consider an optional Panel mode? - freeze: keep content at its starting size while panel boundaries move; hide scrollbars during dragging and update content on release. - preview: move a divider indicator, then resize the group on release. A local prototype on the existing Nested groups example delivers ~20 pointer updates/sec live vs ~60 with the new Freeze and Preview options—a 3× gain in pointer-update throughput. Production build, 1,000 rows, Chrome 152 headless, 6× CPU throttling, five-second continuous drag, three samples per mode. These are pointer updates, not FPS. Five paired comparisons against main found no meaningful default-live throughput regression in this fixture. Freeze also avoids repeated text wrapping during dragging. Final content layout still costs work on release. The implementation and reproducible profiler are ready for discussion. Would you be open to this API? — Reply to this email directly, view it on GitHub <#745?email_source=notifications&email_token=AAAHHHJS4JUALKYO7BQW6WT5PBZN7A5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJUGU2TIMRWGA3DNJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAHHHK7NWXGSZ3VXWTFRBL5PBZN7AVCNFSNUABFKJSXA33TNF2G64TZHM2TQMJSHA2TEOJTHNEXG43VMU5TKNBVGU2DENRQGY3KC5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/AAAHHHPKIYPFNASKVQTW3OT5PBZN7A5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJUGU2TIMRWGA3DNJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/AAAHHHNWDYSY5MA2GLZNYYD5PBZN7A5CNFSL4Z3JMQ5C6L3HNF2C22DVMIXUS43TOVSS6NJUGU2TIMRWGA3DNJTSMVQXG33OVJZXKYTTMNZGSYTFMSSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[bvaughn]

Added in #746

[bvaughn]

This feature is available in version 4.13.0