No-one is going to give you exact numbers because most R2R users do not own the plugin, and also there are all the different factors between your system and theirs. So I would consider the changes from 1.1.2 to 1.3.1 first, before thinking about downgrading versions:

You said:
what changes were made between oeksound soothe2 v 1.1.2 and v 1.3.1?
Big Evil AI said:

Spoiler

Here are the changes introduced between Soothe2 v1.1.2 and v1.3.1, according to Oeksound’s official changelog oeksound.com+11oeksound.com+11instagram.com+11:

️ Soothe2 v1.1.2 (Nov 19, 2020)

• Bug fix: Resolved an issue with enabling/disabling frequency graph nodes.

Intermediate Versions Summary
v1.2.0 (May 27, 2021)

• Performance boost: Significantly optimized processing for modern CPUs.
  
  
• Compatibility update: Full Big Sur support.
  
  
• Fixes: Logic Pro 10.6.2 crash avoidance, EQ node position stability, resolved UI freeze/freezes in Windows + Pro Tools on many instances.

v1.2.1 (Jul 14, 2021)

• Crash fix for older Intel (i7-3xxx) Windows CPUs.

v1.2.2 (Nov 8, 2021)

• New option to lock quality parameters and delta when changing presets.
  
  
• Better Avid control-surface mapping, improved Bitwig idle performance, resolved Reaper rendering glitch.

v1.3.0 (May 2, 2022)

• Apple Silicon support: Native M1 compatibility on macOS.
  
  
• Fresh presets from Henkka and Luis Barrera Jr.
  
  
• Dropped 32‑bit support on Windows.
  
  
• Minor UI enhancements and updated tutorial integration.
  
  
• Numerous smaller bug & stability fixes focused on preset browsing, Pro Tools automation preview, visual consistency, and rare system issues.

✅ Soothe2 v1.3.1 (Nov 21, 2022)

• New stereo tutorial added to the plugin.
  
  
• Added a preset by Jaycen Joshua.
  
  
• Improved stability when running multiple instances.
  
  
• Various minor bug fixes and polish.

At-a-glance comparison
Version Key Highlights
1.1.2 Fixed node enable/disable bug.
1.2.x Performance upgrades, UI tweaks, and multiple DAW-specific bug fixes.
1.3.0 Added Apple Silicon support, new presets, tutorial tweaks, and extra bug fixes.
1.3.1 Tutorial enhancements, new preset, improved multi-instance stability.
In summary, between v1.1.2 and v1.3.1, Soothe2 received major performance upgrades, broader DAW compatibility, key feature additions like Apple Silicon support and tutorials, multiple preset expansions, and ongoing stability refinements—culminating in the user-friendly improvements found in v1.3.1 oeksound.com+5oeksound.com+5motka.net+5motka.netaudionewsroom.net.

If none of the changes matter to you, you will get your best answer by actually trying it.