#5278 Reduce reallocs

2 files changed, 4 insertions, 0 deletions

diff --git a/indra/llui/llkeywords.cpp b/indra/llui/llkeywords.cpp
index bbcb45f100..c4272401b9 100644
--- a/indra/llui/llkeywords.cpp
+++ b/indra/llui/llkeywords.cpp
@@ -506,6 +506,8 @@ void LLKeywords::collectSegmentOps(segment_ops_t& ops, const LLWString& wtext, b
     {
         return;
     }
+    // Heuristic to reduce reallocation churn on large scripts.
+    ops.reserve(wtext.size() / 8);
 
     const llwchar* base = wtext.c_str();
     const llwchar* cur = base;
diff --git a/indra/newview/llscripteditor.cpp b/indra/newview/llscripteditor.cpp
index 68c4077b89..2a4c2b9d0b 100644
--- a/indra/newview/llscripteditor.cpp
+++ b/indra/newview/llscripteditor.cpp
@@ -443,6 +443,7 @@ void LLScriptEditor::queueSyntaxApply(LLWString text,
 
     resetPendingSyntaxApply();
 
+    // Small updates can apply synchronously; larger ones use background slices.
     constexpr size_t kImmediateOpsThreshold = 500;
     if (ops.size() <= kImmediateOpsThreshold)
     {
@@ -481,6 +482,7 @@ void LLScriptEditor::processPendingSyntaxApply()
         return;
     }
 
+    // Slice sizes control UI budget while applying large highlight updates.
     constexpr size_t kOpsPerSlice = 250;
     constexpr size_t kSegmentsPerSlice = 250;