DPF doc update for 261 (2025.10.28)

Author: 4rmuuser

2026R1/dpf-framework-26-r1/changelog/changelog.md

@@ -1,6 +1,6 @@
 # Changelog
 
-Changes since the last released version for DPF 26.1.pre1 (as of 2025-10-27).
+Changes since the last released version for DPF 26.1.pre1 (as of 2025-10-28).
 
 This changelog is organized by category, with sections for different types of updates (new features, bug fixes, changes, performance improvements).
 
@@ -20,7 +20,7 @@ The following table shows which components have updates in each category.
 | eng_mat |  |[1 item](#Fixes_eng_mat) |
 | expansion | [1 item](#Features_expansion) | |
 | fbs | [2 items](#Features_fbs) | |
-| femutils |  |[2 items](#Fixes_femutils) |
+| femutils |  |[3 items](#Fixes_femutils) |
 | framework | [2 items](#Features_framework) |[1 item](#Fixes_framework) |
 | grpc | [1 item](#Features_grpc) |[1 item](#Fixes_grpc) |
 | h5dpf | [1 item](#Features_h5dpf) |[1 item](#Fixes_h5dpf) |
@@ -243,6 +243,13 @@ The following table shows which components have updates in each category.
 
 ### <a id="Fixes_femutils"></a> Fixes
 
+- Performance and result issue with split_fields:
+  > 
+  >
+  > Performance issue with the `split_fields` operator when several meshes are the input.
+  >
+  > 
+
 - BugFix in op normals_provider_nl:
   > 
   >