---
title: Javascript-SDK - 4.8.0
slug: feature-experimentation/release-notes/javascript-sdk-4-8-0
docTags: 
createdAt: 2026-07-20T15:45:40.383Z
---

## \[4.8.0]

November 29, 2021

### New Features

\- Added a Lite bundle which does not include Data file manager and Event Processor packages. This reduces the bundle size up to 20% and is helpful for some platforms (such as edge service providers) that do not need extended functionality offered by these packages.
\- Removed Client engine validation in the SDK to allow tracking events from new clients without modifying SDK code.

### Performance Improvements

\- Reduced SDK client initialization time by removing \`OptimizelyConfig\` creation from initialization. The \`OptimizelyConfig\` object is now created on the first call to \`getOptimizelyConfig\` API.
\- Made Improvements to logging mechanism. The SDK no longer concatenates and formats messages which do not qualify for the log level set by the user.

### Changed

\- Updated \`json-schema\` package version to \`0.4.0\` to fix a high-severity vulnerability (\[Prototype Pollution]\([https://snyk.io/vuln/SNYK-JS-JSONSCHEMA-1920922](https://snyk.io/vuln/SNYK-JS-JSONSCHEMA-1920922))).

[https://github.com/optimizely/javascript-sdk/releases/tag/v4.8.0](https://github.com/optimizely/javascript-sdk/releases/tag/v4.8.0)