Fix interactive viz freezing: switch sliders to updatemode=mouseup

sbryngelson · claude · sbryngelson · commit c12bb9adccf9 · 2026-02-24T21:14:41.000-05:00
Drag mode fires a callback on every pixel of movement, overwhelming
the server when data loading + figure build takes &gt;100ms. Mouseup
fires only on release, eliminating callback queue buildup.

Co-Authored-By: Claude Sonnet 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/toolchain/mfc/viz/interactive.py b/toolchain/mfc/viz/interactive.py
@@ -86,7 +86,7 @@ def _lbl(text):
 def _slider(sid, lo, hi, step, val, marks=None):
     return dcc.Slider(
         id=sid, min=lo, max=hi, step=step, value=val,
-        marks=marks or {}, updatemode='drag',
+        marks=marks or {}, updatemode='mouseup',
         tooltip={'placement': 'bottom', 'always_visible': True},
     )
 

Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ def _lbl(text):`
`86`	`86`	`def _slider(sid, lo, hi, step, val, marks=None):`
`87`	`87`	`return dcc.Slider(`
`88`	`88`	`id=sid, min=lo, max=hi, step=step, value=val,`
`89`		`- marks=marks or {}, updatemode='drag',`
	`89`	`+ marks=marks or {}, updatemode='mouseup',`
`90`	`90`	`tooltip={'placement': 'bottom', 'always_visible': True},`
`91`	`91`	`)`
`92`	`92`