Desktop Chrome:

Flattened, in Attributes, with namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	91583	0.5
OTLP JSON	162619	1.2
OTLP with key dictionary	29444	1.0

Exported 121 events.

Nested, in Body, no namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	37148	0.3
OTLP JSON	108184	0.7
OTLP with key dictionary	26446	0.8

Exported 121 events.

On mobile Chrome S23 Ultra

Flattened, in Attributes, with namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	91583	0.3
OTLP JSON	162619	1.0
OTLP with key dictionary	29444	0.8

Exported 121 events.

Nested, in Body, no namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	37148	0.2
OTLP JSON	108184	0.4
OTLP with key dictionary	26446	0.5

Exported 121 events.

On mobile Oneplus 5 (2017)

Flattened, in Attributes, with namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	91583	0.8
OTLP JSON	162619	2.3
OTLP with key dictionary	29444	2.6

Exported 121 events.

Nested, in Body, no namespaces

Encoding	Wire size (bytes)	Encoding duration (ms)
JSON.stringify as-is	37148	0.6
OTLP JSON	108184	1.5
OTLP with key dictionary	26446	1.9

Exported 121 events.