From 6b7c52799d44bf361208a7dd8698570e28ef1f8e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sat, 7 Feb 2026 00:02:10 +0100
Subject: [PATCH] [nextion] Batch UART reads to reduce loop overhead

---
 esphome/components/nextion/nextion.cpp | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/esphome/components/nextion/nextion.cpp b/esphome/components/nextion/nextion.cpp
index fd6ce0a24b2..f3a24de30ad 100644
--- a/esphome/components/nextion/nextion.cpp
+++ b/esphome/components/nextion/nextion.cpp
@@ -397,11 +397,21 @@ bool Nextion::remove_from_q_(bool report_empty) {
 }
 
 void Nextion::process_serial_() {
-  uint8_t d;
+  int avail = this->available();
+  if (avail == 0) {
+    return;
+  }
 
-  while (this->available()) {
-    read_byte(&d);
-    this->command_data_ += d;
+  // Read all available bytes in batches to reduce UART call overhead.
+  uint8_t buf[64];
+  while (avail > 0) {
+    size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
+    if (!this->read_array(buf, to_read)) {
+      break;
+    }
+    avail -= to_read;
+
+    this->command_data_.append(reinterpret_cast<char *>(buf), to_read);
   }
 }
 // nextion.tech/instruction-set/