-1,7 +1,37 
 # Changelog
 
+## 8.46.0
+
+### Behavioral Changes
+
+- Collections returned by scope (e.g. `getBreadcrumbs`, `getTags`, `getAttachments`) are shared state and should not be mutated. ([#5541](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5541))
+  - Previously, when going through `CombinedScopeView`, we were returning a copy where mutations didn't show up in the underlying scopes.
+  - This has now changed in order to reduce SDK overhead.
+- `Date` objects returned by SDK data model getters are shared state and should not be mutated. ([#5603](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5603))
+  - Previously, these getters returned defensive copies for some date fields.
+  - This has now changed in order to reduce SDK overhead.
+
+### Performance
+
+- Reduce writer buffer size from 8192 to 512 ([#5544](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5544))
+- Remove redundant event map copies ([#5536](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5536))
+- Optimize combined scope by adding an early return if only one scope has data ([#5541](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5541))
+- Reduce model access overhead by avoiding defensive `Date` copies in SDK data model getters. ([#5603](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5603))
+- Reduce timestamp parsing and formatting overhead with Sentry-specific ISO-8601 handling. ([#5602](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5602))
+- Reduce JSON serialization overhead by creating the reflection serializer only when unknown-object fallback serialization is needed. ([#5601](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5601))
+- Reduce JSON serialization overhead by allocating reflection cycle-tracking state only when reflection serialization is used. ([#5600](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5600))
+- Reduce context serialization overhead by sorting key snapshots with arrays instead of temporary lists. ([#5599](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5599))
+- Reduce breadcrumb allocation overhead by creating the `Breadcrumb` data map only when data is added. ([#5598](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5598))
+- Reduce JSON serialization overhead by lowering the initial `JsonWriter` nesting stack size while preserving on-demand growth. ([#5591](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5591))
+- Reduce timestamp helper overhead by replacing unnecessary `Calendar` usage in `DateUtils` with direct `Date` creation. ([#5589](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5589))
+- Reduce Android startup overhead by using the default timezone directly on older devices or when no timezone info is available in the locale. ([#5587](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5587))
+
 ## 8.45.0
 
+### Features
+
+- On Android 15+ (API 35), the standalone `app.start` transaction now reports why the OS started the process via `app.vitals.start.reason` trace data (e.g. `launcher`, `broadcast`, `service`, `content_provider`), derived from `ApplicationStartInfo.getReason()`. You can search and group by this attribute in the Trace Explorer. ([#5552](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5552))
+
 ### Fixes
 
 - Use `System.nanoTime()` for cron check-in duration measurement to avoid incorrect durations from wall-clock adjustments ([#5611](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5611))
 -41,7 +71,6 
   - Emits a transaction named `App Start` with op `app.start`, carrying the existing app start measurements and phase spans (`process.load`, `contentprovider.load`, `application.load`, activity lifecycle spans) as direct children of the root
   - The standalone transaction shares the same `traceId` as the first `ui.load` activity transaction so they remain linked in the trace view
   - Also covers non-activity starts (broadcast receivers, services, content providers)
-  - On Android 15+ (API 35), the standalone `app.start` transaction reports why the OS started the process via `app.vitals.start.reason` trace data (e.g. `launcher`, `broadcast`, `service`, `content_provider`), derived from `ApplicationStartInfo.getReason()`. You can search and group by this attribute in the Trace Explorer. ([#5552](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5552))
 
 ### Improvements
 
 -61,6 +90,12 
 - Fix attachments being duplicated on native events that carry scope attachments ([#5548](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5548))
 - Fix performance collector scheduling many tasks in a row ([#5524](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5524))
 
+## 8.43.3
+
+### Fixes
+
+- Fix crash when `getHistoricalProcessStartReasons` is called from an isolated or wrong-userId process ([#5597](https://github-redirect.dependabot.com/getsentry/sentry-java/pull/5597))
+
 ## 8.43.2
 
 ### Improvements