diff --git a/frameworks/JavaScript/fastify/app.js b/frameworks/JavaScript/fastify/app.js
index 3c93710e83d..12b3aa0440c 100755
--- a/frameworks/JavaScript/fastify/app.js
+++ b/frameworks/JavaScript/fastify/app.js
@@ -1,11 +1,11 @@
 const cluster = require("cluster");
-const numCPUs = require("os").cpus().length;
+const physicalCpuCount = require("physical-cpu-count")
 
 if (cluster.isPrimary) {
   console.log(`Primary ${process.pid} is running`);
 
   // Fork workers.
-  for (let i = 0; i < numCPUs; i++) {
+  for (let i = 0; i < physicalCpuCount; i++) {
     cluster.fork();
   }
 
diff --git a/frameworks/JavaScript/fastify/fastify-mysql.dockerfile b/frameworks/JavaScript/fastify/fastify-mysql.dockerfile
index dce82ff1a90..5a7848d77e2 100644
--- a/frameworks/JavaScript/fastify/fastify-mysql.dockerfile
+++ b/frameworks/JavaScript/fastify/fastify-mysql.dockerfile
@@ -1,4 +1,4 @@
-FROM node:18.12.1-alpine
+FROM node:18.12.1-slim
 
 COPY ./ ./
 
diff --git a/frameworks/JavaScript/fastify/fastify-postgres.dockerfile b/frameworks/JavaScript/fastify/fastify-postgres.dockerfile
index 65bf195566d..6d740699084 100644
--- a/frameworks/JavaScript/fastify/fastify-postgres.dockerfile
+++ b/frameworks/JavaScript/fastify/fastify-postgres.dockerfile
@@ -1,4 +1,4 @@
-FROM node:18.12.1-alpine
+FROM node:18.12.1-slim
 
 COPY ./ ./
 
diff --git a/frameworks/JavaScript/fastify/fastify.dockerfile b/frameworks/JavaScript/fastify/fastify.dockerfile
index fdd8dcf4946..88c1feef67c 100644
--- a/frameworks/JavaScript/fastify/fastify.dockerfile
+++ b/frameworks/JavaScript/fastify/fastify.dockerfile
@@ -1,4 +1,4 @@
-FROM node:18.12.1-alpine
+FROM node:18.12.1-slim
 
 COPY ./ ./
 
diff --git a/frameworks/JavaScript/fastify/package.json b/frameworks/JavaScript/fastify/package.json
index e0740139501..e7f103b0355 100644
--- a/frameworks/JavaScript/fastify/package.json
+++ b/frameworks/JavaScript/fastify/package.json
@@ -11,6 +11,7 @@
     "knex": "2.4.2",
     "mongodb": "3.5.9",
     "mysql2": "2.2.5",
-    "pg": "8.5.1"
+    "pg": "8.5.1",
+    "physical-cpu-count": "^2.0.0"
   }
 }