diff --git a/src/kiri/app/alerts.js b/src/kiri/app/alerts.js
index 6fa72f1f..a54f1dac 100644
--- a/src/kiri/app/alerts.js
+++ b/src/kiri/app/alerts.js
@@ -82,36 +82,14 @@ function update(clear) {
     }
 }
 
-/**
- * Update progress bar display.
- * In debug mode, also shows progress status message.
- * @param {number} [value=0] - Progress value (0.0 to 1.0)
- * @param {string} [msg] - Optional status message to display
- */
-function progress(value = 0, msg) {
-    value = (value * 100).round(4);
-    api.ui.progress.width = value+'%';
-    if (self.debug) {
-        // console.log(msg, value.round(2));
-        api.ui.prostatus.style.display = 'flex';
-        if (msg) {
-            api.ui.prostatus.innerHTML = msg;
-        } else {
-            api.ui.prostatus.innerHTML = '';
-        }
-    }
-}
-
 export {
     hide,
     show,
-    update,
-    progress
+    update
 };
 
 export default {
     hide,
     show,
-    update,
-    progress
+    update
 };
diff --git a/src/kiri/app/api.js b/src/kiri/app/api.js
index 7ecceb8b..d7520350 100644
--- a/src/kiri/app/api.js
+++ b/src/kiri/app/api.js
@@ -238,7 +238,7 @@ export const api = {
         import() { api.ui.import.style.display = '' },
         layer: visuals.set_visible_layer,
         local() { console.trace('deprecated') },
-        progress: alerts.progress,
+        progress: visuals.set_progress,
         slices: visuals.show_slices,
         tools: showTools
     },
diff --git a/src/kiri/app/init/sync.js b/src/kiri/app/init/sync.js
index 93b10010..bff4f9c9 100644
--- a/src/kiri/app/init/sync.js
+++ b/src/kiri/app/init/sync.js
@@ -165,7 +165,7 @@ function ui_sync() {
     preferences.setThreaded(true);
     preferences.lineTypeSave();
     preferences.detailSave();
-    preferences.updateStats();
+    api.visuals.update_stats();
 
     // optional set-and-lock mode (hides mode menu)
     let SETMODE = SETUP.mode ? SETUP.mode[0] : null;
diff --git a/src/kiri/app/preferences.js b/src/kiri/app/preferences.js
index c3e3cc01..8facac53 100644
--- a/src/kiri/app/preferences.js
+++ b/src/kiri/app/preferences.js
@@ -6,12 +6,10 @@ import { base } from '../../geo/base.js';
 import { space } from '../../moto/space.js';
 
 let { client, platform } = api;
-let ui, statsTimer;
 
 // Lazy initialization to avoid circular dependencies
 function getUI() {
-    if (!ui) ui = api.ui;
-    return ui;
+    return api.ui;
 }
 
 function settings() {
@@ -107,7 +105,7 @@ function booleanSave() {
     // platform.layout();
     api.conf.save();
     api.platform.update_size();
-    updateStats();
+    api.visuals.update_stats();
     updateDrawer();
     api.event.emit('boolean.update');
     space.view.setProjection(control.ortho ? 'orthographic' : 'perspective');
@@ -119,34 +117,6 @@ function updateDrawer() {
     $c('app', scrolls ? '' : 'hide-scroll', scrolls ? 'hide-scroll' : '');
 }
 
-function updateStats() {
-    if (self.debug !== true) {
-        return;
-    }
-    console.log('updateStats()');
-    const ui = getUI();
-    let { div, fps, rms, rnfo } = ui.stats;
-    div.style.display = 'flex';
-    clearTimeout(statsTimer);
-    statsTimer = setInterval(() => {
-        const nrms = space.view.getRMS().toFixed(1);
-        const nfps = space.view.getFPS().toFixed(1);
-        const rend = space.renderInfo();
-        const { memory, render } = rend;
-        if (nfps !== fps.innerText) {
-            fps.innerText = nfps;
-        }
-        if (nrms !== rms.innerText) {
-            rms.innerText = nrms;
-        }
-        if (rnfo.offsetParent !== null) {
-            rnfo.innerHTML = Object.entries({ ...memory, ...render, render_ms: nrms, frames_sec: nfps }).map(row => {
-                return `<div>${row[0]}</div><label>${base.util.comma(row[1])}</label>`
-            }).join('');
-        }
-    }, 100);
-}
-
 export const preferences = {
     unitsSave,
     aniMeshSave,
@@ -155,6 +125,5 @@ export const preferences = {
     speedSave,
     setThreaded,
     booleanSave,
-    updateDrawer,
-    updateStats
+    updateDrawer
 };
diff --git a/src/kiri/app/visuals.js b/src/kiri/app/visuals.js
index d9ef410f..3e7201a5 100644
--- a/src/kiri/app/visuals.js
+++ b/src/kiri/app/visuals.js
@@ -1,9 +1,11 @@
 /** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
 import { api } from './api.js';
+import { base } from '../../geo/base.js';
 import { consts } from '../core/consts.js';
 import { settings } from './conf/manager.js';
-import { space as SPACE } from '../../moto/space.js';
+import { space } from '../../moto/space.js';
+
 import STACKS from './stacks.js';
 
 const { COLOR, VIEWS } = consts;
@@ -111,7 +113,7 @@ function setVisibleLayer(h, l) {
  */
 function setWireframe(bool, color, opacity) {
     api.widgets.each(function(w) { w.setWireframe(bool, color, opacity) });
-    SPACE.update();
+    space.update();
 }
 
 /**
@@ -129,7 +131,7 @@ function setEdges(bool) {
     }
     bool = api.local.getBoolean('model.edges');
     api.widgets.each(w => w.setEdges(bool));
-    SPACE.update();
+    space.update();
 }
 
 /**
@@ -207,7 +209,7 @@ function showSlices(layer) {
     updateSlider();
     // STACKS.setRange is called by slider callback
 
-    SPACE.update();
+    space.update();
 }
 
 /**
@@ -239,7 +241,59 @@ function updateStackLabelState() {
     }
 }
 
+/**
+ * Update progress bar display.
+ * In debug mode, also shows progress status message.
+ * @param {number} [value=0] - Progress value (0.0 to 1.0)
+ * @param {string} [msg] - Optional status message to display
+ */
+function setProgress(value = 0, msg) {
+    value = (value * 100).round(4);
+    api.ui.progress.width = value+'%';
+    if (self.debug) {
+        // console.log(msg, value.round(2));
+        api.ui.prostatus.style.display = 'flex';
+        if (msg) {
+            api.ui.prostatus.innerHTML = msg;
+        } else {
+            api.ui.prostatus.innerHTML = '';
+        }
+    }
+}
+
+let statsTimer;
+
+function updateStats() {
+    clearTimeout(statsTimer);
+    let { div, fps, rms, rnfo } = api.ui.stats;
+    if (api.devel.enabled === false) {
+        fps.innerText = '';
+        rms.innerText = '';
+        rnfo.innerHTML = '';
+        return;
+    }
+    div.style.display = 'flex';
+    statsTimer = setInterval(() => {
+        const nrms = space.view.getRMS().toFixed(1);
+        const nfps = space.view.getFPS().toFixed(1);
+        const rend = space.renderInfo();
+        const { memory, render } = rend;
+        if (nfps !== fps.innerText) {
+            fps.innerText = nfps;
+        }
+        if (nrms !== rms.innerText) {
+            rms.innerText = nrms;
+        }
+        if (rnfo.offsetParent !== null) {
+            rnfo.innerHTML = Object.entries({ ...memory, ...render, render_ms: nrms, frames_sec: nfps }).map(row => {
+                return `<div>${row[0]}</div><label>${base.util.comma(row[1])}</label>`
+            }).join('');
+        }
+    }, 100);
+}
+
 export const visuals = {
+    set_progress: setProgress,
     set_wireframe: setWireframe,
     set_edges: setEdges,
     unit_scale: unitScale,
@@ -247,6 +301,7 @@ export const visuals = {
     update_slider: updateSlider,
     update_slider_max: updateSliderMax,
     update_stack_labels: updateStackLabelState,
+    update_stats: updateStats,
     show_slices: showSlices,
     hide_slices: hideSlices,
     show_slider: showSlider,
diff --git a/src/kiri/mode/fdm/slice.js b/src/kiri/mode/fdm/slice.js
index 5bc215da..b6505093 100644
--- a/src/kiri/mode/fdm/slice.js
+++ b/src/kiri/mode/fdm/slice.js
@@ -119,12 +119,13 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
     let render = settings.render !== false,
         { minions } = self.kiri_worker,
         { process, device, controller } = settings,
+        { devel, assembly, threaded } = controller,
         isBelt = device.bedBelt,
-        isBrick = controller.devel && process.sliceZInterleave,
+        isBrick = devel && process.sliceZInterleave,
         isSynth = widget.track.synth,
         isSupport = widget.track.support,
-        useAssembly = controller.assembly,
-        isConcurrent = controller.threaded && minions.concurrent,
+        useAssembly = assembly,
+        isConcurrent = threaded && minions.concurrent,
         topLayers = process.sliceTopLayers || 0,
         bottomLayers = process.sliceBottomLayers || 0,
         vaseMode = process.sliceFillType === 'vase' && !isSynth,
@@ -343,7 +344,7 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
             if (changes && !isSynth) {
                 healed = true;
                 slice.changes = changes;
-                if (self.debug) {
+                if (devel) {
                     console.log('slice healed', slice.index, slice.z, changes);
                 }
             }