diff --git a/.gitignore b/.gitignore
index 07ba847..c5f1f2e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,4 +29,7 @@ msbuild.err
 msbuild.wrn
 
 # Visual Studio 2015
-.vs/
\ No newline at end of file
+.vs/
+
+*.class
+perf
\ No newline at end of file
diff --git a/perfs/README.md b/perfs/README.md
new file mode 100644
index 0000000..0e9cb6e
--- /dev/null
+++ b/perfs/README.md
@@ -0,0 +1,42 @@
+# Performance
+
+Platform: Intel(R) Core(TM) i5-4308U CPU @ 2.80GHz / 16GB 1600 MHz DDR3
+
+```sh
+$ clang --version
+Apple clang version 11.0.0 (clang-1100.0.33.12)
+Target: x86_64-apple-darwin19.0.0
+$ clang -O3 perf.c -o perf
+$ time ./perf
+0.66 real         0.64 user         0.00 sys
+$ time for i in {1..30}; do ./perf; done
+real    0m19.697s
+user    0m19.356s
+sys     0m0.086s
+```
+
+```sh
+$ java --version
+openjdk 11.0.4 2019-07-16
+OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.4+11)
+OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.4+11, mixed mode)
+$ javac Perf.java
+$ time java Perf
+2.83 real         2.74 user         0.04 sys
+$ time for i in {1..30}; do java Perf; done
+real    1m23.663s
+user    1m21.008s
+sys     0m1.173s
+```
+
+```sh
+$dotnet --version
+3.0.100
+$ dotnet publish -r osx-x64 -c release /p:PublishSingleFile=true
+$ time bin/release/netcoreapp3.0/osx-x64/publish/perfs
+1.08 real         1.04 user         0.03 sys
+$ time for i in {1..30}; do bin/release/netcoreapp3.0/osx-x64/publish/perfs; done
+real    0m38.211s
+user    0m31.473s
+sys     0m0.958s
+```
\ No newline at end of file
diff --git a/perfs/clang/perf.c b/perfs/clang/perf.c
new file mode 100644
index 0000000..bdd1d1d
--- /dev/null
+++ b/perfs/clang/perf.c
@@ -0,0 +1,15 @@
+#include <math.h>
+#include <stdlib.h>
+
+long Sum(long a, long b){
+    return a + b + rand();
+}
+
+int main(void){
+    long sum = 0;
+    for (long count = 0; count < pow(10,8); count++)
+    {
+        sum = Sum(sum, count);
+    }
+    return (int)sum;
+}
\ No newline at end of file
diff --git a/perfs/cs/Program.cs b/perfs/cs/Program.cs
new file mode 100644
index 0000000..eb3f6e3
--- /dev/null
+++ b/perfs/cs/Program.cs
@@ -0,0 +1,22 @@
+using System;
+
+namespace perfs
+{
+    class Program
+    {
+        private static readonly Random random = new Random();
+
+        static long Sum(long a, long b)
+        {
+            return a + b + random.Next();
+        }
+        static void Main(string[] args)
+        {
+            long sum = 0;
+            for (long count = 0; count < Math.Pow(10, 8); count++)
+            {
+                sum = Sum(sum, count);
+            }
+        }
+    }
+}
diff --git a/perfs/cs/perfs.csproj b/perfs/cs/perfs.csproj
new file mode 100644
index 0000000..958d2f1
--- /dev/null
+++ b/perfs/cs/perfs.csproj
@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>
diff --git a/perfs/java/Perf.java b/perfs/java/Perf.java
new file mode 100644
index 0000000..16855a8
--- /dev/null
+++ b/perfs/java/Perf.java
@@ -0,0 +1,18 @@
+import java.lang.Math; 
+import java.util.Random;
+
+public class Perf {
+    private static Random random = new Random();
+
+    public static long Sum(long a, long b){
+        return a + b + random.nextInt();
+    }
+
+    public static void main(String args[]) {  
+        long sum = 0;
+        for(long count = 0; count < Math.pow(10, 8); count++)
+        {
+            sum = Sum(sum, count);
+        }
+    }
+}
\ No newline at end of file