Mobile/WebGL Shader Performance Question

Hello,

We are exploring options to help improve the performance of our game for WebGL and Mobile platforms.

This is the current shader we are using, and I wanted to get your thoughts on it to see if there is room for increasing performance.

 Shader "Custom/Specular" {
 Properties {
     _Color ("Main Color", Color) = (1,1,1,1)
     _SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1)
     _EmissionColor("Emission Color", Color) = (1,1,1,1)
     _Shininess ("Shininess", Range (0.01, 1)) = 0.078125
     _MainTex ("Base (RGB) Gloss (RGB)", 2D) = "white" {}
     _EmissionLM ("Emission (Lightmapper)", Float) = 0
     _EmissionLevel("Emission Level", Range (1, 30)) = 12
 }
 SubShader {
     Tags { "RenderType"="Opaque" }
     
 CGPROGRAM
 #pragma surface surf BlinnPhong
 
 sampler2D _MainTex;
 fixed4 _Color;
 fixed4 _EmissionColor;
 half _Shininess;
 float _EmissionLevel;
 
 struct Input {
     float2 uv_MainTex;
 };
 
 void surf (Input IN, inout SurfaceOutput o) {
     fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
     fixed4 c = tex * _Color;
     o.Albedo = c.rgb;
     o.Emission = c.rgb * _EmissionLevel *_EmissionColor * tex2D(_MainTex, IN.uv_MainTex).a;
     o.Gloss = tex.rgb;
     o.Alpha = c.a;
     o.Specular = _Shininess;
 }
 ENDCG
 }
 FallBack "Self-Illumin/Diffuse"
 }

Thanks in advance.