Nestjs vs plain express performance

Question

I just tested performance on a simple socket controller that returns the text of a receive request (without a database). And the same simple GET controller (middleware) with an expression.

I used the WRK tool to test performance.

And as a result, a simple express is 2 times faster than nestjs. Why is there so much overhead created by nestjs?

Answer 1

The following list shows what Nest does compared to a regular express route handler:

• it surrounds your body with a route handler using try..catch blocks.
• he makes each route handler async
• he creates a global express router
• .
• body-parser ( json, urlencoded)

(, 99,9% - , ). , Express Nest, . :

app.get('/', (req, res, next) => res.status(200).send('Hello world'));

, . , , ( 4.16.2): ​​

Running 10s test @ http://localhost:3000
1024 connections

Stat         Avg    Stdev   Max
Latency (ms) 225.67 109.97  762
Req/Sec      4560   1034.78 5335
Bytes/Sec    990 kB 226 kB  1.18 MB

46k requests in 10s, 9.8 MB read

, Nest :

• , Promise/Observable/plain
• send() json() ( +1)
• 3 (if ) ,

Nest (4.5.8):

Running 10s test @ http://localhost:3000
1024 connections

Stat         Avg    Stdev   Max
Latency (ms) 297.79 55.5    593
Req/Sec      3433.2 367.84  3649
Bytes/Sec    740 kB 81.9 kB 819 kB

34k requests in 10s, 7.41 MB read

, Nest 79% (-21%). , , , Nest Node 6.11.x, , async/await - .

? , , . Hello world , :)

PS. autocannon library https://github.com/mcollina/autocannon

autocannon -c 1024 -t30 http://localhost:3000