> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ionworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 2026 01 12

<Update label="January 12, 2026" description="Faster data uploads, MSMR extrapolation, and performance improvements">
  ## Faster data uploads

  Data uploads now use signed URLs instead of JSON request bodies, eliminating timeouts when uploading large datasets. This is especially noticeable for files that previously failed to upload due to size limits.

  [Find out more →](/data/uploading)

  ## OCP data interpolation with MSMR extrapolation

  OCP fitting now blends measured data with MSMR physics-based fits, providing smooth interpolation within the data range and physically-grounded extrapolation outside it.

  ## Performance improvements

  Pipeline loading is significantly faster thanks to reduced unnecessary fetching and elimination of duplicate element requests. Database queries have also been optimized with new indexes and a more efficient authentication check.

  <AccordionGroup>
    <Accordion title="Studio">
      **Improvements**

      * Default model constants are now available for parameterized models.
      * API responses include a correlation ID for easier troubleshooting.
      * Route guards added for projects and cyclers to prevent unauthorized access.

      **Fixes**

      * Fixed infinite recursion when switching organizations.
      * Fixed variable names in the optimization creation form.
    </Accordion>

    <Accordion title="Pipeline">
      **Improvements**

      * Composite MSMR support for multi-particle electrode models.
      * Improved round-trip serialization support for optimizers.

      **Fixes**

      * Pchip interpolation errors are now wrapped as NumericalErrors to prevent unexpected pipeline failures.
    </Accordion>

    <Accordion title="Protocol Simulator">
      **Improvements**

      * Additional solver options can now be passed through as keyword arguments for finer control over solver behavior.

      **Fixes**

      * Fixed solver warnings during protocol simulation.
    </Accordion>
  </AccordionGroup>
</Update>