gRPC transport in NestJS - Performance & Optimization

Performance: gRPC transport

MEDIUM IMPACT

This affects the speed and efficiency of communication between frontend and backend services, impacting interaction responsiveness and load times.

Choosing a communication protocol for microservices in a NestJS app

NestJS

import { Transport, ClientsModule } from '@nestjs/microservices';

@Module({
  imports: [
    ClientsModule.register([{ name: 'SERVICE', transport: Transport.GRPC, options: { package: 'service', protoPath: 'service.proto' } }]),
  ],
})
export class AppModule {}

gRPC uses binary protocol buffers, reducing payload size and connection overhead with persistent HTTP/2 connections.

📈 Performance GainReduces latency by 30-70ms per request, lowers bandwidth usage by 50%

Choosing a communication protocol for microservices in a NestJS app

NestJS

import { Transport, ClientsModule } from '@nestjs/microservices';

@Module({
  imports: [
    ClientsModule.register([{ name: 'SERVICE', transport: Transport.HTTP }]),
  ],
})
export class AppModule {}

Using HTTP/REST transport causes larger payloads and higher latency due to verbose JSON and stateless connections.

📉 Performance CostAdds 50-100ms latency per request, larger payload sizes increase bandwidth usage

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
HTTP/REST transport	N/A	N/A	N/A	[!] OK
gRPC transport	N/A	N/A	N/A	[OK] Good

Rendering Pipeline

gRPC transport optimizes the network communication stage by using HTTP/2 and binary serialization, reducing time before data reaches the frontend rendering pipeline.

→Network

→Interaction Handling

⚠️ BottleneckNetwork latency and serialization/deserialization time

Core Web Vital Affected

INP

This affects the speed and efficiency of communication between frontend and backend services, impacting interaction responsiveness and load times.

Optimization Tips

1Use gRPC transport to reduce network latency with binary serialization.

2Leverage HTTP/2 multiplexing in gRPC to improve request concurrency.

3Avoid REST for high-frequency microservice calls to improve INP.

Performance Quiz - 3 Questions

How does gRPC transport improve performance compared to REST in NestJS microservices?

A By caching all responses on the client side automatically

B By using JSON over HTTP/1.1 for simpler requests

C By using binary serialization and HTTP/2 multiplexing to reduce latency and payload size

D By compressing images before sending them

DevTools: Network

How to check: Open DevTools, go to Network tab, filter by gRPC or HTTP requests, compare payload sizes and timing between REST and gRPC calls.

What to look for: Look for smaller payload sizes and lower request latency in gRPC calls compared to REST.