diff --git a/CHANGELOG.md b/CHANGELOG.md
index 103ba445..5c8f6614 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,8 +9,10 @@
   
 ## Changelog
   
-### **HEAD -> main** 2022/09/02 mandic00@live.com
+### **HEAD -> main** 2022/09/03 mandic00@live.com
 
+- release preview
+- optimize startup sequence
 - reorder backend init code
 - test embedding
 - embedding test
diff --git a/package.json b/package.json
index cf3ebc71..a9bb880f 100644
--- a/package.json
+++ b/package.json
@@ -97,7 +97,7 @@
     "rimraf": "^3.0.2",
     "seedrandom": "^3.0.5",
     "tslib": "^2.4.0",
-    "typedoc": "0.23.13",
+    "typedoc": "0.23.14",
     "typescript": "4.8.2"
   }
 }
diff --git a/src/tfjs/backend.ts b/src/tfjs/backend.ts
index 2da092cf..543ba7c3 100644
--- a/src/tfjs/backend.ts
+++ b/src/tfjs/backend.ts
@@ -158,8 +158,8 @@ export async function check(instance: Human, force = false) {
 
     // customize humangl
     if (tf.getBackend() === 'humangl' || tf.getBackend() === 'webgl') {
-      if (tf.env().flagRegistry.WEBGL_USE_SHAPES_UNIFORMS) tf.env().set('WEBGL_USE_SHAPES_UNIFORMS', true); // default=false <https://github.com/tensorflow/tfjs/issues/5205>
-      if (tf.env().flagRegistry.WEBGL_EXP_CONV) tf.env().set('WEBGL_EXP_CONV', true); // default=false <https://github.com/tensorflow/tfjs/issues/6678>
+      // if (tf.env().flagRegistry.WEBGL_USE_SHAPES_UNIFORMS) tf.env().set('WEBGL_USE_SHAPES_UNIFORMS', true); // default=false <https://github.com/tensorflow/tfjs/issues/5205>
+      // if (tf.env().flagRegistry.WEBGL_EXP_CONV) tf.env().set('WEBGL_EXP_CONV', true); // default=false <https://github.com/tensorflow/tfjs/issues/6678>
       // if (tf.env().flagRegistry['WEBGL_PACK_DEPTHWISECONV'])  tf.env().set('WEBGL_PACK_DEPTHWISECONV', false); // default=true <https://github.com/tensorflow/tfjs/pull/4909>
       // if (tf.env().flagRegistry.USE_SETTIMEOUTCUSTOM) tf.env().set('USE_SETTIMEOUTCUSTOM', true); // default=false <https://github.com/tensorflow/tfjs/issues/6687>
       // if (tf.env().flagRegistry.CPU_HANDOFF_SIZE_THRESHOLD) tf.env().set('CPU_HANDOFF_SIZE_THRESHOLD', 1024); // default=1000
diff --git a/test/build.log b/test/build.log
index ec5ffef4..376beac3 100644
--- a/test/build.log
+++ b/test/build.log
@@ -1,39 +1,39 @@
-2022-09-03 07:09:51 DATA:  Build {"name":"@vladmandic/human","version":"2.10.0"} 
-2022-09-03 07:09:51 INFO:  Application: {"name":"@vladmandic/human","version":"2.10.0"} 
-2022-09-03 07:09:51 INFO:  Environment: {"profile":"production","config":".build.json","package":"package.json","tsconfig":true,"eslintrc":true,"git":true} 
-2022-09-03 07:09:51 INFO:  Toolchain: {"build":"0.7.11","esbuild":"0.15.6","typescript":"4.8.2","typedoc":"0.23.13","eslint":"8.23.0"} 
-2022-09-03 07:09:51 INFO:  Build: {"profile":"production","steps":["clean","compile","typings","typedoc","lint","changelog"]} 
-2022-09-03 07:09:51 STATE: Clean: {"locations":["dist/*","types/lib/*","typedoc/*"]} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"tfjs/nodejs/cpu","format":"cjs","platform":"node","input":"tfjs/tf-node.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":159,"outputBytes":608} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"human/nodejs/cpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node.js","files":75,"inputBytes":656531,"outputBytes":308656} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"tfjs/nodejs/gpu","format":"cjs","platform":"node","input":"tfjs/tf-node-gpu.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":167,"outputBytes":612} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"human/nodejs/gpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-gpu.js","files":75,"inputBytes":656535,"outputBytes":308660} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"tfjs/nodejs/wasm","format":"cjs","platform":"node","input":"tfjs/tf-node-wasm.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":206,"outputBytes":664} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"human/nodejs/wasm","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-wasm.js","files":75,"inputBytes":656587,"outputBytes":308710} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"tfjs/browser/version","format":"esm","platform":"browser","input":"tfjs/tf-version.ts","output":"dist/tfjs.version.js","files":1,"inputBytes":1125,"outputBytes":358} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"tfjs/browser/esm/nobundle","format":"esm","platform":"browser","input":"tfjs/tf-browser.ts","output":"dist/tfjs.esm.js","files":2,"inputBytes":1088,"outputBytes":583} 
-2022-09-03 07:09:51 STATE: Compile: {"name":"human/browser/esm/nobundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm-nobundle.js","files":75,"inputBytes":656506,"outputBytes":307530} 
-2022-09-03 07:09:52 STATE: Compile: {"name":"tfjs/browser/esm/custom","format":"esm","platform":"browser","input":"tfjs/tf-custom.ts","output":"dist/tfjs.esm.js","files":11,"inputBytes":1344,"outputBytes":2821914} 
-2022-09-03 07:09:52 STATE: Compile: {"name":"human/browser/iife/bundle","format":"iife","platform":"browser","input":"src/human.ts","output":"dist/human.js","files":75,"inputBytes":3477837,"outputBytes":1687720} 
-2022-09-03 07:09:52 STATE: Compile: {"name":"human/browser/esm/bundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm.js","files":75,"inputBytes":3477837,"outputBytes":3108728} 
-2022-09-03 07:09:56 STATE: Typings: {"input":"src/human.ts","output":"types/lib","files":30} 
-2022-09-03 07:09:58 STATE: TypeDoc: {"input":"src/human.ts","output":"typedoc","objects":77,"generated":true} 
-2022-09-03 07:09:58 STATE: Compile: {"name":"demo/typescript","format":"esm","platform":"browser","input":"demo/typescript/index.ts","output":"demo/typescript/index.js","files":1,"inputBytes":6714,"outputBytes":3134} 
-2022-09-03 07:09:58 STATE: Compile: {"name":"demo/faceid","format":"esm","platform":"browser","input":"demo/faceid/index.ts","output":"demo/faceid/index.js","files":2,"inputBytes":15488,"outputBytes":7788} 
-2022-09-03 07:10:09 STATE: Lint: {"locations":["*.json","src/**/*.ts","test/**/*.js","demo/**/*.js"],"files":110,"errors":0,"warnings":0} 
-2022-09-03 07:10:10 STATE: ChangeLog: {"repository":"https://github.com/vladmandic/human","branch":"main","output":"CHANGELOG.md"} 
-2022-09-03 07:10:10 STATE: Copy: {"input":"tfjs/tfjs.esm.d.ts"} 
-2022-09-03 07:10:10 INFO:  Done... 
-2022-09-03 07:10:10 STATE: API-Extractor: {"succeeeded":true,"errors":0,"warnings":193} 
-2022-09-03 07:10:10 STATE: Copy: {"input":"types/human.d.ts"} 
-2022-09-03 07:10:10 INFO:  Analyze models: {"folders":8,"result":"models/models.json"} 
-2022-09-03 07:10:10 STATE: Models {"folder":"./models","models":13} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../human-models/models","models":42} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../blazepose/model/","models":4} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../anti-spoofing/model","models":1} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../efficientpose/models","models":3} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../insightface/models","models":5} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../movenet/models","models":3} 
-2022-09-03 07:10:10 STATE: Models {"folder":"../nanodet/models","models":4} 
-2022-09-03 07:10:11 STATE: Models: {"count":57,"totalSize":383017442} 
-2022-09-03 07:10:11 INFO:  Human Build complete... {"logFile":"test/build.log"} 
+2022-09-03 17:17:20 DATA:  Build {"name":"@vladmandic/human","version":"2.10.0"} 
+2022-09-03 17:17:20 INFO:  Application: {"name":"@vladmandic/human","version":"2.10.0"} 
+2022-09-03 17:17:20 INFO:  Environment: {"profile":"production","config":".build.json","package":"package.json","tsconfig":true,"eslintrc":true,"git":true} 
+2022-09-03 17:17:20 INFO:  Toolchain: {"build":"0.7.11","esbuild":"0.15.6","typescript":"4.8.2","typedoc":"0.23.14","eslint":"8.23.0"} 
+2022-09-03 17:17:20 INFO:  Build: {"profile":"production","steps":["clean","compile","typings","typedoc","lint","changelog"]} 
+2022-09-03 17:17:20 STATE: Clean: {"locations":["dist/*","types/lib/*","typedoc/*"]} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/nodejs/cpu","format":"cjs","platform":"node","input":"tfjs/tf-node.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":159,"outputBytes":608} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"human/nodejs/cpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node.js","files":75,"inputBytes":656537,"outputBytes":308492} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/nodejs/gpu","format":"cjs","platform":"node","input":"tfjs/tf-node-gpu.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":167,"outputBytes":612} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"human/nodejs/gpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-gpu.js","files":75,"inputBytes":656541,"outputBytes":308496} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/nodejs/wasm","format":"cjs","platform":"node","input":"tfjs/tf-node-wasm.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":206,"outputBytes":664} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"human/nodejs/wasm","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-wasm.js","files":75,"inputBytes":656593,"outputBytes":308546} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/browser/version","format":"esm","platform":"browser","input":"tfjs/tf-version.ts","output":"dist/tfjs.version.js","files":1,"inputBytes":1125,"outputBytes":358} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/browser/esm/nobundle","format":"esm","platform":"browser","input":"tfjs/tf-browser.ts","output":"dist/tfjs.esm.js","files":2,"inputBytes":1088,"outputBytes":583} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"human/browser/esm/nobundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm-nobundle.js","files":75,"inputBytes":656512,"outputBytes":307366} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"tfjs/browser/esm/custom","format":"esm","platform":"browser","input":"tfjs/tf-custom.ts","output":"dist/tfjs.esm.js","files":11,"inputBytes":1344,"outputBytes":2821914} 
+2022-09-03 17:17:20 STATE: Compile: {"name":"human/browser/iife/bundle","format":"iife","platform":"browser","input":"src/human.ts","output":"dist/human.js","files":75,"inputBytes":3477843,"outputBytes":1687572} 
+2022-09-03 17:17:21 STATE: Compile: {"name":"human/browser/esm/bundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm.js","files":75,"inputBytes":3477843,"outputBytes":3108530} 
+2022-09-03 17:17:25 STATE: Typings: {"input":"src/human.ts","output":"types/lib","files":30} 
+2022-09-03 17:17:27 STATE: TypeDoc: {"input":"src/human.ts","output":"typedoc","objects":77,"generated":true} 
+2022-09-03 17:17:27 STATE: Compile: {"name":"demo/typescript","format":"esm","platform":"browser","input":"demo/typescript/index.ts","output":"demo/typescript/index.js","files":1,"inputBytes":6714,"outputBytes":3134} 
+2022-09-03 17:17:27 STATE: Compile: {"name":"demo/faceid","format":"esm","platform":"browser","input":"demo/faceid/index.ts","output":"demo/faceid/index.js","files":2,"inputBytes":15488,"outputBytes":7788} 
+2022-09-03 17:17:38 STATE: Lint: {"locations":["*.json","src/**/*.ts","test/**/*.js","demo/**/*.js"],"files":110,"errors":0,"warnings":0} 
+2022-09-03 17:17:38 STATE: ChangeLog: {"repository":"https://github.com/vladmandic/human","branch":"main","output":"CHANGELOG.md"} 
+2022-09-03 17:17:38 STATE: Copy: {"input":"tfjs/tfjs.esm.d.ts"} 
+2022-09-03 17:17:38 INFO:  Done... 
+2022-09-03 17:17:39 STATE: API-Extractor: {"succeeeded":true,"errors":0,"warnings":193} 
+2022-09-03 17:17:39 STATE: Copy: {"input":"types/human.d.ts"} 
+2022-09-03 17:17:39 INFO:  Analyze models: {"folders":8,"result":"models/models.json"} 
+2022-09-03 17:17:39 STATE: Models {"folder":"./models","models":13} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../human-models/models","models":42} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../blazepose/model/","models":4} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../anti-spoofing/model","models":1} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../efficientpose/models","models":3} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../insightface/models","models":5} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../movenet/models","models":3} 
+2022-09-03 17:17:39 STATE: Models {"folder":"../nanodet/models","models":4} 
+2022-09-03 17:17:40 STATE: Models: {"count":57,"totalSize":383017442} 
+2022-09-03 17:17:40 INFO:  Human Build complete... {"logFile":"test/build.log"}