diff --git a/.github/workflows/build-workflow.yaml b/.github/workflows/build-workflow.yaml
index a53a6fbd..cf9dcc40 100644
--- a/.github/workflows/build-workflow.yaml
+++ b/.github/workflows/build-workflow.yaml
@@ -18,6 +18,7 @@ jobs:
         run: |
           build/duk -e "print(Duktape.env); print('Hello world!');"
           build/duk dist-files/mandel.js
+          build/duk-g++ dist-files/mandel.js
   build_duk_macos:
     name: Duk macOS 10.15
     runs-on: macos-10.15
diff --git a/README.md b/README.md
index 817179bd..f1de8264 100644
--- a/README.md
+++ b/README.md
@@ -110,19 +110,19 @@ If you intend to change Duktape internals and want to rebuild the source
 distributable in Linux, macOS, or Windows:
 
     # Linux; can often install from packages or using 'pip'
-    # Install Node.js >= 14.x
+    # Install Node.js >= 16.x
     $ sudo apt-get install python python-yaml
     $ python util/dist.py
 
     # macOS
     # Install Python 2.7.x
-    # Install Node.js >= 14.x
+    # Install Node.js >= 16.x
     $ pip install PyYAML
     $ python util/dist.py
 
     # Windows
     ; Install Python 2.7.x from python.org, and add it to PATH
-    ; Install Node.js >= 14.x
+    ; Install Node.js >= 16.x
     > pip install PyYAML
     > python util\dist.py
 
diff --git a/docker/duktape-base-ubuntu-18.04-x64/Dockerfile b/docker/duktape-base-ubuntu-18.04-x64/Dockerfile
index b5c8bdd2..d6d7d94c 100644
--- a/docker/duktape-base-ubuntu-18.04-x64/Dockerfile
+++ b/docker/duktape-base-ubuntu-18.04-x64/Dockerfile
@@ -18,7 +18,7 @@ RUN echo "=== Timezone setup ===" && \
 # Duktape, the duktape.org website, run tests, etc.
 RUN echo "=== Node.js and package install ===" && \
 	apt-get update && apt-get install -qqy curl && \
-	curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
+	curl -sL https://deb.nodesource.com/setup_16.x | bash - && \
 	dpkg --add-architecture i386 && \
 	apt-get update && \
 	apt-get install -qqy \
diff --git a/docker/duktape-base-ubuntu-20.04-arm64/Dockerfile b/docker/duktape-base-ubuntu-20.04-arm64/Dockerfile
index b91c77d4..66880ed5 100644
--- a/docker/duktape-base-ubuntu-20.04-arm64/Dockerfile
+++ b/docker/duktape-base-ubuntu-20.04-arm64/Dockerfile
@@ -18,7 +18,7 @@ RUN echo "=== Timezone setup ===" && \
 # Duktape, the duktape.org website, run tests, etc.
 RUN echo "=== Node.js and package install ===" && \
 	apt-get update && apt-get install -qqy curl && \
-	curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
+	curl -sL https://deb.nodesource.com/setup_16.x | bash - && \
 	apt-get update && \
 	apt-get install -qqy \
 		build-essential llvm valgrind strace libc6-dbg \
diff --git a/docker/duktape-base-ubuntu-20.04-x64/Dockerfile b/docker/duktape-base-ubuntu-20.04-x64/Dockerfile
index 234f33f7..55b0edc9 100644
--- a/docker/duktape-base-ubuntu-20.04-x64/Dockerfile
+++ b/docker/duktape-base-ubuntu-20.04-x64/Dockerfile
@@ -18,7 +18,7 @@ RUN echo "=== Timezone setup ===" && \
 # Duktape, the duktape.org website, run tests, etc.
 RUN echo "=== Node.js and package install ===" && \
 	apt-get update && apt-get install -qqy curl && \
-	curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
+	curl -sL https://deb.nodesource.com/setup_16.x | bash - && \
 	dpkg --add-architecture i386 && \
 	apt-get update && \
 	apt-get install -qqy \
diff --git a/tests/perf/.eslintignore b/tests/perf/.eslintignore
new file mode 100644
index 00000000..2ccbe465
--- /dev/null
+++ b/tests/perf/.eslintignore
@@ -0,0 +1 @@
+/node_modules/
diff --git a/tests/perf/.eslintrc.yml b/tests/perf/.eslintrc.yml
new file mode 100644
index 00000000..881f2602
--- /dev/null
+++ b/tests/perf/.eslintrc.yml
@@ -0,0 +1,27 @@
+env:
+  browser: true
+  commonjs: true
+  es6: true
+extends: 'eslint:recommended'
+globals:
+  Atomics: readonly
+  SharedArrayBuffer: readonly
+  process: readonly
+  __dirname: readonly
+  Buffer: readonly
+  CBOR: readonly
+  print: writable
+  Duktape: readonly
+parserOptions:
+  ecmaVersion: 2018
+rules:
+  strict: off
+  no-self-assign: off
+  no-unused-vars: off
+  no-empty: off
+  no-constant-condition: off
+  no-unreachable: off
+  no-tabs: error
+  no-control-regex: off
+  no-trailing-spaces: error
+  no-warning-comments: [ 1, { "terms": ["todo", "fixme", "xxx"], "location": "anywhere" } ]