Android is never Java 9+, so the System.getProperty +
Double.valueOf parse in the Platform static initializer is
unnecessary overhead on the Android cold-start path.
Short-circuit to isJavaNinePlus=false when isAndroid is true.

Avoid allocating and sorting a merged breadcrumb queue when only one component scope has breadcrumbs. This keeps the full merge path for multi-scope breadcrumbs and returns the default write scope queue when all scopes are empty.

Co-Authored-By: Claude <noreply@anthropic.com>

Use an explicit 512-character BufferedWriter buffer for envelope item and envelope serialization. This avoids allocating the oversized default char buffer for each short-lived serialization writer while preserving the existing OutputStreamWriter-based encoding path.

Co-Authored-By: Claude <noreply@anthropic.com>

Avoid creating temporary maps when applying scope and options tags or scope extras. The event setters already copy these maps, so this preserves snapshot semantics while reducing allocation overhead.

Co-Authored-By: Claude <noreply@anthropic.com>

…ies-v2

perf(core): [SDK Overhead reduction for JVM 1] Remove redundant event map copies

…iter-buffer-512

…buffer-512

perf(core): [SDK Overhead reduction for JVM 3] Reduce writer buffer size

…erf/sdk-overhead-jvm-breadcrumbs-v3

Avoid allocating merged collection copies when only one combined scope contains values. This extends the breadcrumbs optimization to tags, attributes, extras, and attachments while preserving merge behavior when multiple scopes contribute data.

Co-Authored-By: Claude <noreply@anthropic.com>

…umbs-v3

perf(core): [SDK Overhead reduction for JVM 2] Short-circuit combined scope breadcrumbs

…latform-android-skip

perf(core): [SDK Overhead Reduction 1] Skip java.specification.version lookup on Android

…ptions-container

perf(android): [SDK Overhead Reduction 2] Replace reflective OptionsContainer with direct subclass

Avoid constructing a Calendar only to read the default device timezone. The locale passed to Calendar does not affect the timezone value, so TimeZone.getDefault returns the same value with less work during device context collection.

Co-Authored-By: Claude <noreply@anthropic.com>

Avoid constructing Calendar instances when DateUtils only needs the current epoch millis or a Date for an existing millis value. Date stores epoch millis without timezone state, so the returned values are unchanged while avoiding unnecessary Calendar allocation and field computation.

Co-Authored-By: Claude <noreply@anthropic.com>

Shrink the vendored JsonWriter nesting stack from 32 entries to 8 entries. The stack still grows on demand for deeply nested payloads, while common SDK serialization avoids the larger initial array allocation.

Co-Authored-By: Claude <noreply@anthropic.com>

Avoid allocating a ConcurrentHashMap for breadcrumbs that never set data. Initialize the data map on first write while preserving concurrent writes with double-checked locking.

Co-Authored-By: Claude <noreply@anthropic.com>

…ate-utils

perf(core): [SDK Overhead Reduction 5] Replace Calendar with Date in DateUtils

…uction-json-writer-stack

…son-writer-stack

perf(core): [SDK Overhead Reduction 6] Reduce JsonWriter stack allocation

…uction-breadcrumb-lazy-data

…readcrumb-lazy-data

perf(core): [SDK Overhead Reduction 7] Lazily allocate Breadcrumb data

…ontexts-key-array

perf(core): [SDK Overhead Reduction 8] Reduce context serialization allocations

…uction-reflection-visiting

…eflection-visiting

perf(core): [SDK Overhead Reduction 9] Lazily allocate reflection serializer state

…uction-reflection-serializer

…eflection-serializer

perf(core): [SDK Overhead Reduction 10] Lazily create reflection JSON serializer

…o perf/sdk-overhead-reduction-fast-dates

# Conflicts:
#	CHANGELOG.md
#	sentry/src/main/java/io/sentry/DateUtils.java

…o perf/sdk-overhead-jvm-v2

# Conflicts:
#	CHANGELOG.md

…ast-dates

perf(core): [SDK Overhead Reduction 11] Replace ISO8601 timestamp handling

…so8601-compat

fix(core): [SDK Overhead Reduction 13] Preserve ISO8601 utility compatibility

…uction-date-getters

…ate-getters

perf(core): [SDK Overhead Reduction 12] Avoid cloning Date getters

perf(core): SDK Overhead reduction for JVM