Benchmarks
Each ZShot release is measured on EC2 after it publishes, and the latest release again every Monday. A release’s numbers appear here at the next site build.
ZShot 0.57.1 runs as scaleassembly/zshot-server on a fresh EC2 instance in us-east-2. It renders the page-medium fixture, a self-contained page of about 330 KB, as a 1280×800 PNG after networkidle0. Each level of 1, 4, 8 and 16 concurrent requests runs for 120 s after 5 warmup renders. Capacity is the 8-concurrent level, and about 500 ms of every render is the networkidle0 wait.
Capacity
| Instance | vCPU | Renders per hour | p50 | p95 | CPU per render | Peak memory | Per 1,000 renders |
|---|---|---|---|---|---|---|---|
m5. | 2 | 15,828 | 1,815 ms | 1,981 ms | 416 ms | 584 MiB | $0.00607 |
m5. | 4 | 28,429 | 1,007 ms | 1,135 ms | 411 ms | 792 MiB | $0.00675 |
Cost is the on-demand Linux price read 2026-10-30: $0.096 an hour for m5.large, $0.192 an hour for m5.xlarge. Each figure is the median over the release's runs.
By Concurrency
m5.large
Run on 2026-10-30
| Concurrent | Renders per hour | p50 | p95 | p99 | Idle memory | Peak memory |
|---|---|---|---|---|---|---|
| 1 | 4,817 | 745 ms | 775 ms | 780 ms | 122 MiB | 237 MiB |
| 4 | 15,142 | 942 ms | 1,063 ms | 1,195 ms | 122 MiB | 509 MiB |
| 8 | 15,948 | 1,806 ms | 1,974 ms | 2,024 ms | 118 MiB | 581 MiB |
| 16 | 15,239 | 3,766 ms | 3,974 ms | 4,082 ms | 126 MiB | 619 MiB |
m5.xlarge
Run on 2026-10-30
| Concurrent | Renders per hour | p50 | p95 | p99 | Idle memory | Peak memory |
|---|---|---|---|---|---|---|
| 1 | 5,108 | 702 ms | 724 ms | 735 ms | 124 MiB | 242 MiB |
| 4 | 19,130 | 734 ms | 835 ms | 898 ms | 122 MiB | 548 MiB |
| 8 | 28,170 | 1,015 ms | 1,149 ms | 1,234 ms | 111 MiB | 787 MiB |
| 16 | 27,817 | 2,058 ms | 2,228 ms | 2,297 ms | 119 MiB | 852 MiB |
By Release
Releases are compared only on one instance type and one fixture.
| Instance | ZShot | Runs | Renders per hour | p95 | Peak memory |
|---|---|---|---|---|---|
m5. | 0.57.1 | 2 | 15,828 | 1,981 ms | 584 MiB |
m5. | 0.57.0 | 2 | 15,275 | 2,058 ms | 582 MiB |
m5. | 0.56.0 | 2 | 15,210 | 2,046 ms | 567 MiB |
m5. | 0.55.0 | 2 | 15,408 | 2,027 ms | 554 MiB |
m5. | 0.54.2 | 4 | 15,282 | 2,049 ms | 599 MiB |
m5. | 0.57.1 | 2 | 28,429 | 1,135 ms | 792 MiB |
m5. | 0.57.0 | 2 | 28,398 | 1,127 ms | 774 MiB |
m5. | 0.56.0 | 2 | 28,996 | 1,114 ms | 793 MiB |
m5. | 0.55.0 | 2 | 28,046 | 1,142 ms | 744 MiB |
m5. | 0.54.2 | 4 | 28,516 | 1,128 ms | 776 MiB |