diff --git a/README.md b/README.md
index c3911a5..997912c 100644
--- a/README.md
+++ b/README.md
@@ -47,9 +47,10 @@ The following site settings are avaible:
 | name | description | values | default |
 | --- | --- | --- | --- |
 | `agreeExpire` | number of months before users are shown the site agreement dialog again<br />set to 0 to display dialog on every reload | integer >= 0 | 3 |
-| `demo` | set to **true** to enable demo mode by default | boolean | false
+| `demo` | set to **true** to enable demo mode by default | boolean | false |
 | `regions` | array of regions names to enable | thorax, abdomen, limbs, head | [thorax, abdomen, limbs, head] |
 | `useExternal` | detemines the ability to use an external detection server:<br />**none** - external server cannot be configured<br />**optional** - external server can be configured in the app's settings page<br />**list** - external server can be selected in the app's settings page but only the configured server(s) may be selected<br />**required** - external server settings from conf file will be used by default and disable server options in the settings page | none, optional, list, required | **optional** |
+| `disableWorkers` | force app to use a single thread for detection computations instead of multi threading web workers | boolean | **optional** |
 | `external` | properties of the external server(s) ALVINN may connect to<br />This setting must be a single element array if **useExternal** is set to **required**.<br />This setting must be an array of one or more elements if **useExternal** is set to **list** | external server settings array | []|
 | `infoUrl` | root url for links to information about identified structures<br />Structure labels with spaces replaced by underscores will be appended to this value for full information links (*e.g.,* Abdominal_diapragm) | string | info link not shown |
 
diff --git a/public/conf/conf.yaml b/public/conf/conf.yaml
index 8c9adc7..f124937 100644
--- a/public/conf/conf.yaml
+++ b/public/conf/conf.yaml
@@ -6,7 +6,7 @@ regions:
   - limbs
   - head
 useExternal: none
-disableWorkers: true
+disableWorkers: false
 external:
   - name: Mserver
     address: "192.169.1.105"
diff --git a/src/pages/detect.vue b/src/pages/detect.vue
index 7dd69ed..243077d 100644
--- a/src/pages/detect.vue
+++ b/src/pages/detect.vue
@@ -362,7 +362,9 @@
             this.detectWorker.postMessage({call: 'localDetect', image: res[1]}, [res[1]])
           })
         } else {
-          this.localDetect(this.imageView).then(dets => {
+          createImageBitmap(this.imageView).then(res => {
+            return this.localDetect(res)
+          }).then(dets => {
             this.detecting = false
             this.resultData = dets
             this.uploadDirty = true