diff --git a/modules/scene/controls/CADTrackballControls.js b/modules/scene/controls/CADTrackballControls.js
index 15f45e70..5444165c 100644
--- a/modules/scene/controls/CADTrackballControls.js
+++ b/modules/scene/controls/CADTrackballControls.js
@@ -77,7 +77,6 @@ export function CADTrackballControls( object, domElement ) {
 
   // events
 
-  var changeEvent = { type: 'change' };
   var startEvent = { type: 'start' };
   var endEvent = { type: 'end' };
 
@@ -304,7 +303,7 @@ export function CADTrackballControls( object, domElement ) {
 
   };
 
-  this.update = function () {
+  this.evaluate = function () {
 
     _eye.subVectors( _this.object.position, _this.target );
 
@@ -332,16 +331,12 @@ export function CADTrackballControls( object, domElement ) {
 
     _this.object.lookAt( _this.target );
 
-    if ( lastPosition.distanceToSquared( _this.object.position ) > EPS || this.projectionChanged) {
-
+    const needsRender = lastPosition.distanceToSquared( _this.object.position ) > EPS || this.projectionChanged;
+    if ( needsRender) {
       this.projectionChanged = false;
-      
-      _this.dispatchEvent( changeEvent );
-
       lastPosition.copy( _this.object.position );
-
     }
-
+    return needsRender;
   };
 
   this.reset = function () {
@@ -357,8 +352,6 @@ export function CADTrackballControls( object, domElement ) {
 
     _this.object.lookAt( _this.target );
 
-    _this.dispatchEvent( changeEvent );
-
     lastPosition.copy( _this.object.position );
 
   };
@@ -656,11 +649,7 @@ export function CADTrackballControls( object, domElement ) {
   window.addEventListener( 'keyup', keyup, false );
 
   this.handleResize();
-
-  // force an update at start
-  this.update();
-
-};
+}
 
 CADTrackballControls.prototype = Object.create( THREE.EventDispatcher.prototype );
 CADTrackballControls.prototype.constructor = CADTrackballControls;
\ No newline at end of file
diff --git a/modules/scene/sceneSetup.ts b/modules/scene/sceneSetup.ts
index f58a5963..1291ae35 100644
--- a/modules/scene/sceneSetup.ts
+++ b/modules/scene/sceneSetup.ts
@@ -16,7 +16,6 @@ import {
   Vector3,
   WebGLRenderer
 } from "three";
-import {TransformControls} from "three/examples/jsm/controls/TransformControls";
 import {stream} from "lstream";
 
 export default class SceneSetUp {
@@ -33,10 +32,9 @@ export default class SceneSetUp {
   private _prevContainerWidth: number;
   private _prevContainerHeight: number;
   trackballControls: CADTrackballControls;
-  transformControls: TransformControls;
-  updateControlsAndHelpers: () => void;
   viewportSizeUpdate$ = stream();
-  
+  renderRequested: boolean;
+
   constructor(container, onRendered) {
     
     this.workingSphere = 10000;
@@ -45,7 +43,8 @@ export default class SceneSetUp {
     this.rootGroup = this.scene;
     this.onRendered = onRendered;
     this.scene.userData.sceneSetUp = this;
-    
+    this.renderRequested = false;
+
     this.setUpCamerasAndLights();
     this.setUpControls();
 
@@ -55,7 +54,11 @@ export default class SceneSetUp {
   aspect() {
     return this.container.clientWidth / this.container.clientHeight;
   }
-  
+
+  requestRender() {
+    this.renderRequested = true;
+  }
+
   createOrthographicCamera() {
     let width = this.container.clientWidth;
     let height = this.container.clientHeight;
@@ -101,7 +104,7 @@ export default class SceneSetUp {
       this.updateOrthographicCameraViewport();
       this.renderer.setSize( this.container.clientWidth, this.container.clientHeight );
       this.viewportSizeUpdate$.next();
-      this.render();
+      this.__render_NeverCallMeFromOutside();
     }
   }
 
@@ -148,8 +151,7 @@ export default class SceneSetUp {
     
     this.camera = camera;
     this.trackballControls.object = camera;
-    this.transformControls.camera = camera;
-    this.updateControlsAndHelpers();
+    this.requestRender();
   }
 
   setUpControls() {
@@ -173,29 +175,7 @@ export default class SceneSetUp {
     trackballControls.dynamicDampingFactor = 0.3;
 
     trackballControls.keys = [ 65, 83, 68 ];
-    trackballControls.addEventListener( 'change', () => this.render());
-
-    let transformControls: any = new TransformControls( this.camera, this.renderer.domElement );
-    transformControls.addEventListener( 'change', () => this.render() );
-    this.scene.add( transformControls );
-    
     this.trackballControls = trackballControls;
-    this.transformControls = transformControls;
-
-    let updateTransformControls = () => {
-      if (transformControls.object !== undefined) {
-        if (transformControls.object.parent === undefined) {
-          transformControls.detach();
-          this.render();
-        }
-        transformControls.update();
-      }
-    };
-
-    this.updateControlsAndHelpers = function() {
-      trackballControls.update();
-      updateTransformControls();
-    };
   }
 
   createRaycaster(viewX, viewY) {
@@ -288,11 +268,15 @@ export default class SceneSetUp {
   
   animate() {
     requestAnimationFrame( () => this.animate() );
-    this.updateControlsAndHelpers();
+    const controlsChangedViewpoint = this.trackballControls.evaluate();
+    if (controlsChangedViewpoint || this.renderRequested) {
+      this.__render_NeverCallMeFromOutside();
+    }
     this.updateViewportSizeIfNeeded();
   };
 
-  render() {
+  private __render_NeverCallMeFromOutside() {
+    this.renderRequested = false;
     this.light.position.set(this.camera.position.x, this.camera.position.y, this.camera.position.z);
     this.renderer.render(this.scene, this.camera);
     this.onRendered();
diff --git a/web/app/cad/actions/usabilityActions.js b/web/app/cad/actions/usabilityActions.js
index 64a3890d..1469040f 100644
--- a/web/app/cad/actions/usabilityActions.js
+++ b/web/app/cad/actions/usabilityActions.js
@@ -1,5 +1,7 @@
 import Vector, {AXIS, ORIGIN} from 'math/vector';
 import {RiCamera2Line} from "react-icons/ri";
+import {ViewMode} from "cad/scene/viewer";
+import {GiCube, HiCube, HiOutlineCube} from "react-icons/all";
 
 const NEG_X = AXIS.X.negate();
 const NEG_Y = AXIS.Y.negate();
@@ -192,4 +194,37 @@ export default [
       noWizardFocus: true
     })
   },
+  {
+    id: 'ViewMode_WIREFRAME_ON',
+    appearance: {
+      label: 'wireframe',
+      icon: HiOutlineCube,
+    },
+    invoke: ctx => {
+      ctx.services.viewer.viewMode$.next(ViewMode.WIREFRAME);
+      ctx.services.viewer.requestRender();
+    }
+  },
+  {
+    id: 'ViewMode_SHADED_ON',
+    appearance: {
+      label: 'shaded',
+      icon: HiCube,
+    },
+    invoke: ctx => {
+      ctx.services.viewer.viewMode$.next(ViewMode.SHADED);
+      ctx.services.viewer.requestRender();
+    }
+  },
+  {
+    id: 'ViewMode_SHADED_WITH_EDGES_ON',
+    appearance: {
+      label: 'shaded with edges',
+      icon: GiCube,
+    },
+    invoke: ctx => {
+      ctx.services.viewer.viewMode$.next(ViewMode.SHADED_WITH_EDGES);
+      ctx.services.viewer.requestRender();
+    }
+  },
 ]
\ No newline at end of file
diff --git a/web/app/cad/craft/operationPlugin.ts b/web/app/cad/craft/operationPlugin.ts
index d4f21910..072c4226 100644
--- a/web/app/cad/craft/operationPlugin.ts
+++ b/web/app/cad/craft/operationPlugin.ts
@@ -136,7 +136,7 @@ export interface OperationDescriptor<R> {
   previewGeomProvider?: (params: R) => OperationGeometryProvider,
   previewer?: any,
   form: FormDefinition | React.FunctionComponent,
-  defaultActiveField: string,
+  defaultActiveField?: string,
   schema?: OperationSchema,
   onParamsUpdate?: (params, name, value) => void,
   masking?: {
diff --git a/web/app/cad/dom/components/ControlBar.less b/web/app/cad/dom/components/ControlBar.less
index 51ada59c..111a33f9 100644
--- a/web/app/cad/dom/components/ControlBar.less
+++ b/web/app/cad/dom/components/ControlBar.less
@@ -20,7 +20,7 @@
 
 .left, .right {
   display: flex;
-  align-items: baseline;
+  align-items: center;
 }
 
 .right {
@@ -30,6 +30,8 @@
 @border: 1px solid @border-color;
 .left .button {
   border-right: @border;
+  display: flex;
+  align-items: center;
 }
 .right .button {
   border-left: @border;
diff --git a/web/app/cad/dom/components/PlugableControlBar.jsx b/web/app/cad/dom/components/PlugableControlBar.jsx
index ad2ec0a8..2c995d97 100644
--- a/web/app/cad/dom/components/PlugableControlBar.jsx
+++ b/web/app/cad/dom/components/PlugableControlBar.jsx
@@ -23,17 +23,21 @@ function ButtonGroup({actions}) {
 class ActionButton extends React.Component {
   
   render() {
-    let {label, cssIcons, enabled, visible, actionId, ...props} = this.props;
+    let {label, cssIcons, icon, enabled, visible, actionId, ...props} = this.props;
     if (!visible) {
       return null;
     }
+    const Icon = icon ? icon : null;
+
     if (isMenuAction(actionId)) {
       let onClick = props.onClick;
       props.onClick = e => onClick(menuAboveElementHint(this.el));
     }
     
     return <ControlBarButton disabled={!enabled} onElement={el => this.el = el} {...props} >
-      {cssIcons && <Fa fa={cssIcons} fw/>} {label}
+      {cssIcons && <Fa fa={cssIcons} fw/>}
+      {Icon && <Icon />}
+      {label}
     </ControlBarButton>;
   }
 }
diff --git a/web/app/cad/scene/controls/mouseEventSystemPlugin.js b/web/app/cad/scene/controls/mouseEventSystemPlugin.js
index 94a5ddfa..129f6af8 100644
--- a/web/app/cad/scene/controls/mouseEventSystemPlugin.js
+++ b/web/app/cad/scene/controls/mouseEventSystemPlugin.js
@@ -1,11 +1,18 @@
 import {printRaycastDebugInfo, RayCastDebugInfo} from "./rayCastDebug";
-import {LOG_FLAGS} from "../../logFlags";
+import {LOG_FLAGS} from "cad/logFlags";
+import {stream} from "lstream";
+
+const MouseStates = {
+  IDLE: 'IDLE',
+  DOWN: 'DOWN'
+}
 
 export function activate(ctx) {
   const {services, streams} = ctx;
   const domElement = services.viewer.sceneSetup.domElement();
   const event = {
-    viewer: services.viewer
+    viewer: services.viewer,
+    mouseState: MouseStates.IDLE
   };
   
   domElement.addEventListener('mousedown', mousedown, false);
@@ -13,6 +20,12 @@ export function activate(ctx) {
   domElement.addEventListener('mousemove', mousemove, false);
   domElement.addEventListener('dblclick', dblclick, false);
 
+  const onMoveLogicRequest$ = stream();
+
+  onMoveLogicRequest$.throttle(100).attach(() => {
+    const hits = performRaycast(event.mouseEvent);
+    dispatchMousemove(event.mouseEvent, hits)
+  });
 
   let performRaycast = e => {
     const hits = services.viewer.raycast(e, services.cadScene.workGroup.children, RayCastDebugInfo);
@@ -43,6 +56,7 @@ export function activate(ctx) {
   }
   
   function mousedown(e) {
+    event.mouseState = MouseStates.DOWN;
     let hits = performRaycast(e);
     dispatchMousedown(e, hits);
   }
@@ -69,6 +83,7 @@ export function activate(ctx) {
   }
 
   function mouseup(e) {
+    event.mouseState = MouseStates.IDLE;
     event.mouseEvent = e;
     if (toDrag) {
       stopDrag(e);
@@ -111,8 +126,9 @@ export function activate(ctx) {
     if (toDrag) {
       toDrag.dragMove(event);
     } else {
-      let hits = performRaycast(e);
-      dispatchMousemove(e, hits)
+      if (event.mouseState === MouseStates.IDLE) {
+        onMoveLogicRequest$.next();
+      }
     }
   }
 
diff --git a/web/app/cad/scene/viewer.ts b/web/app/cad/scene/viewer.ts
index c39c28da..7da67867 100644
--- a/web/app/cad/scene/viewer.ts
+++ b/web/app/cad/scene/viewer.ts
@@ -1,35 +1,33 @@
-import SceneSetup from 'scene/sceneSetup';
-import {Emitter, externalState, StateStream, stream} from "lstream";
+import {Emitter, externalState, state, StateStream, stream} from "lstream";
 import SceneSetUp from "scene/sceneSetup";
 
+export enum ViewMode {
+  WIREFRAME = 'WIREFRAME',
+  SHADED = 'SHADED',
+  SHADED_WITH_EDGES = 'SHADED_WITH_EDGES'
+}
+
 export default class Viewer {
 
   sceneRendered$: Emitter<any> = stream();
   cameraMode$: StateStream<any>;
-  sceneSetup: SceneSetUp;
-  renderRequested: boolean;
+  viewMode$: StateStream<ViewMode> = state(ViewMode.SHADED_WITH_EDGES);
 
+  sceneSetup: SceneSetUp;
 
   constructor(container, onRendered) {
 
     this.cameraMode$ = externalState(() => this.getCameraMode(), mode => this.setCameraMode(mode))
 
-    this.sceneSetup = new SceneSetup(container, onRendered);
-    this.renderRequested = false;
+    this.sceneSetup = new SceneSetUp(container, onRendered);
   }
   
   render() {
-    this.sceneSetup.render();  
+    this.requestRender();
   }
 
   requestRender = () => {
-    if (this.renderRequested) {
-      return;
-    }
-    setTimeout(() => {
-      this.renderRequested = false;
-      this.render();
-    });
+    this.sceneSetup.requestRender();
   };
   
   setVisualProp = (obj, prop, value) => {
diff --git a/web/app/cad/scene/views/edgeView.js b/web/app/cad/scene/views/edgeView.js
index db2d0838..511958d6 100644
--- a/web/app/cad/scene/views/edgeView.js
+++ b/web/app/cad/scene/views/edgeView.js
@@ -1,4 +1,5 @@
 import {CurveBasedView} from './curveBasedView';
+import {ViewMode} from "cad/scene/viewer";
 
 const MarkerTable = [
   {
@@ -19,5 +20,8 @@ export class EdgeView extends CurveBasedView {
     let brepEdge = edge.brepEdge;
     let tess = brepEdge.data.tessellation ? brepEdge.data.tessellation : brepEdge.curve.tessellateToData();
     super(ctx, edge, tess, 3, 0x000000, MarkerTable);
+    this.addDisposer(ctx.viewer.viewMode$.attach(mode => {
+      this.representation.visible = (mode === ViewMode.SHADED_WITH_EDGES || mode === ViewMode.WIREFRAME);
+    }));
   }
 }
diff --git a/web/app/cad/scene/views/faceView.js b/web/app/cad/scene/views/faceView.js
index 5b981b6d..ad006939 100644
--- a/web/app/cad/scene/views/faceView.js
+++ b/web/app/cad/scene/views/faceView.js
@@ -7,6 +7,7 @@ import {createSolidMaterial} from "cad/scene/views/viewUtils";
 import {SketchMesh} from "cad/scene/views/shellView";
 import {FACE} from "cad/model/entities";
 import {setAttribute} from "scene/objectData";
+import {ViewMode} from "cad/scene/viewer";
 
 export class SketchingView extends View {
   
@@ -69,7 +70,6 @@ export class FaceView extends SketchingView {
     super(ctx, face, parent);
     let geom;
 
-    this.meshFaces = [];
     if (face.brepFace.data.tessellation) {
       geom = tessDataToGeom(face.brepFace.data.tessellation.data)
     } else {
@@ -86,6 +86,10 @@ export class FaceView extends SketchingView {
       this.ctx.highlightService.unHighlight(this.model.id);
     }
     this.rootGroup.add(this.mesh);
+
+    this.addDisposer(ctx.viewer.viewMode$.attach(mode => {
+      this.mesh.visible = (mode === ViewMode.SHADED_WITH_EDGES || mode === ViewMode.SHADED);
+    }));
   }
 
   dispose() {
diff --git a/web/app/cad/workbench/menuConfig.js b/web/app/cad/workbench/menuConfig.js
index 5f0fe9ae..809d9b0d 100644
--- a/web/app/cad/workbench/menuConfig.js
+++ b/web/app/cad/workbench/menuConfig.js
@@ -1,3 +1,5 @@
+import {GiCube} from "react-icons/all";
+
 export default [
   {
     id: 'file',
@@ -26,6 +28,13 @@ export default [
     actions: ['StandardViewFront', 'StandardViewBack', 'StandardViewLeft', 'StandardViewRight', 
       'StandardViewTop', 'StandardViewBottom', 'StandardView3Way']
   },
+  {
+    id: 'viewModes',
+    label: 'mode',
+    icon: GiCube,
+    info: 'view/render mode',
+    actions: ['ViewMode_WIREFRAME_ON', 'ViewMode_SHADED_ON', 'ViewMode_SHADED_WITH_EDGES_ON']
+  },
   {
     id: 'boolean',
     label: 'bool',
diff --git a/web/app/cad/workbench/uiConfigPlugin.js b/web/app/cad/workbench/uiConfigPlugin.js
index 204de06f..3a172daf 100644
--- a/web/app/cad/workbench/uiConfigPlugin.js
+++ b/web/app/cad/workbench/uiConfigPlugin.js
@@ -12,7 +12,7 @@ import {Explorer} from "cad/dom/components/Explorer";
 
 export function activate(ctx) {
   const {services, streams} = ctx;
-  streams.ui.controlBars.left.value = ['menu.file', 'menu.craft', 'menu.boolean', 'menu.primitives', 'menu.views', 'Donate', 'GitHub'];
+  streams.ui.controlBars.left.value = ['menu.file', 'menu.craft', 'menu.boolean', 'menu.primitives', 'menu.views', 'menu.viewModes', 'Donate', 'GitHub'];
   streams.ui.controlBars.right.value = [
     ['Info', {label: null}],
     ['RefreshSketches', {label: null}],