Bun HTTP Framework Benchmark Microservices

Compare throughput benchmarks between microservices and monolith in Bun, using Elysia as the framework.

Test method: Average throughput

1. Ping
   • Request to [GET] /
   • Return hi
   • Headers must contains text Content-Type: text/plain, additional context is acceptable eg. Content-Type: text/plain; charset=utf-8
2. Query
   • Request to [GET] /id/:id
   • Extract path parameter, query string and setting headers.
   • For this benchmark, the request URL will be send as: /id/1?name=bun
   • Headers must contains x-powered-by to benchmark
   • Expected response: "1 bun" (${id} ${query})
     • You MUST NOT use hardcode string or index to extract querystring.
     • In a real-world situation, there's no enforcement that the request will follow the specification, using hardcode index to extract name=bun querystring will be prone to error.
     • To test if it pass the requirement, the implementation should be able to extract querystring dynamically (please treat the value of 'name=bun' can be any value beside 'bun', for example 'alice', 'hina'), which means that the same code should be able to extract querystring, for example:
     • /id/1?name=bun&id=1 -> should return 1 bun not 1 bun&id=1
     • /id/1?id=1 -> should return 1
     • Query beside name maybe not need to be extracted and is optional
   • Headers must contains text Content-Type: text/plain, additional context is acceptable eg. Content-Type: text/plain; charset=utf-8
3. Body
   • [POST] /json
   • Mirror body to response
   • Server MUST parse body to JSON and serialize back to string
   • For the benchmark, the request body will be sent as: { "hello": "world" }
   • Expected response: { "hello": "world" }
   • Headers must contains text Content-Type: application/json, additional context is acceptable eg. Content-Type: application/json; charset=utf-8.

requirement

Prerequistes

• bombardier
• Bun

Run Test

bun benchmark

Dump result will be available at results/[benchmark-name].txt

Benchmark Condition

This benchmark is tested under the following condition:

• AMD Ryzen Threadripper PRO 9995WX s (3) @ 2.500GHz
• 12 GB DDR5
• Ubuntu 22.04.5 LTS x86_64
• Bun 1.3.13

Tested on 4/26/2026

Results

These results are measured in req/s:

Framework	Runtime	Average	Ping	Query	Body
elysia-5-single-instance	bun	122,691.147	169,849.61	113,102.37	85,121.46
elysia-1-monorepo-functions	bun	115,398.22	176,625.29	96,758.69	72,810.68
bun-1-single-instance	bun	111,254.237	143,359.73	108,103.59	82,299.39
bun-1-web-standard-single-instance	bun	93,584.12	107,275.99	92,836.73	80,639.64
fastify-1-single-instance	bun	62,865.347	75,381.52	70,677.66	42,536.86
elysia-2-monorepo-instances	bun	58,434.02	74,519.66	58,607.28	42,175.12
elysia-3-microservices-in-process	bun	42,286.44	55,825.42	39,636.31	31,397.59
express-1-single-instance	bun	39,130.66	36,033.27	38,090.11	43,268.6
elysia-4-microservices-network	bun	13,277.577	16,043.09	11,788.47	12,001.17

Notice

I highly recommended testing this benchmark on your machine yourself as performance in likely to vary between machine.