Every ESP32-S3 build gets a 1 ms tick and LVGL-sized caches

variants/esp32/ESP32_GENERIC_S3/LCD_4_3/mpconfigvariant.cmake

@@ -1,3 +1,3 @@
-# Upstream's octal-PSRAM variant, unchanged. This board's own settings are the
-# sdkconfig beside this file, which build_mp.py appends last.
+# Upstream's octal-PSRAM variant, unchanged. This board needs nothing beyond
+# what every S3 build gets (variants/esp32/sdkconfig.esp32s3).
 include(${MICROPY_BOARD_DIR}/mpconfigvariant_SPIRAM_OCT.cmake)

variants/esp32/ESP32_GENERIC_S3/LCD_7/sdkconfig

@@ -22,30 +22,8 @@ CONFIG_ESP_WIFI_RX_BA_WIN=8
 CONFIG_LWIP_TCP_WND_DEFAULT=16384
 CONFIG_LWIP_TCP_RECVMBOX_SIZE=16
 
-# 1 ms tick. At 100 Hz, MicroPython's sleep_ms() under one tick falls through
-# to mp_hal_delay_us() and busy-waits with the GIL held: appdev's 10 ms loop
-# kept the UI thread 54 % busy while idle and starved every other Python
-# thread, and 2-5 ms native waits rounded down to zero ticks.
-CONFIG_FREERTOS_HZ=1000
-
-# Caches sized for LVGL. Its code runs from flash and its objects and
-# framebuffers live in PSRAM, which the RGB scanout is streaming from at the
-# same time; with the port's 16 KB instruction cache and 32-byte lines every
-# LVGL call ran 5-10x slower than its code. Measured on the remote's UI
-# (2026-09-25): 64-byte lines took a full-screen redraw from 176 to 146 ms;
-# a 32 KB instruction cache then took a list row from 66 to 44 ms and the
-# redraw to 117 ms.
-#
-# A 64 KB data cache on top, measured while the board also decodes and
-# streams audio: full redraw 205 -> 147 ms, panel switch 88 -> 59 ms, 30
-# list rows built 780 -> 399 ms and laid out 608 -> 335 ms. The same layout
-# runs ~216x faster on a desktop, so this board is memory-bound, and the
-# data cache is the lever. Together the caches take 48 KB of internal RAM:
-# free internal went 54 -> 23 KB. Soaked 30 min of real use (about 25 skips
-# and track picks, Wi-Fi streaming and a USB host running): the minimum
-# stayed at 17 KB, with no allocation failures, Wi-Fi drops or audio
-# stalls. (The 24-byte failure above came from every malloc under 8 KB
-# landing in internal RAM; ALWAYSINTERNAL=512 sends those to PSRAM now.)
-CONFIG_ESP32S3_DATA_CACHE_LINE_64B=y
-CONFIG_ESP32S3_INSTRUCTION_CACHE_32KB=y
-CONFIG_ESP32S3_DATA_CACHE_64KB=y
+# The 1 ms tick and the larger caches come from every S3's settings now. With
+# them, free internal RAM under the remote's UI went 54 -> 23 KB, and a 30 min
+# soak of real use stayed above 17 KB with no allocation failures, Wi-Fi drops
+# or audio stalls. (A 24-byte failure on this board came from every malloc
+# under 8 KB landing in internal RAM; ALWAYSINTERNAL=512 sends those to PSRAM.)

variants/esp32/sdkconfig.esp32s3

@@ -44,3 +44,29 @@ CONFIG_LWIP_TCP_SACK_OUT=y
 CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP=y
 CONFIG_ESP_WIFI_RX_BA_WIN=16
 CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=48
+
+# A 1 ms tick and caches sized for LVGL, on every S3 board, whether or not it
+# shipped with a display: a display added after flashing gets the same speed.
+#
+# The tick: at the port's 100 Hz, any wait shorter than 10 ms rounds to a whole
+# tick. DotClockFramebuffer.refresh() polls for the panel to take the new frame
+# with vTaskDelay(1), a 10 ms sleep at 100 Hz, and sleep_ms() under one tick
+# busy-waits with the GIL held.
+#
+# The caches: LVGL's code runs from flash and its objects and frame buffers
+# live in PSRAM, so the port's 16 KB instruction cache, 32 KB data cache and
+# 32-byte lines starve it. Together these take 48 KB of internal RAM.
+#
+# lv_test_timer's kit run, median of three, port defaults -> these four:
+#   Waveshare LCD-4.3 (RGB panel)   10.4 -> 17.7 fps (the tick alone: 17.7)
+#   LilyGO T-Embed (SPI panel)      59.5 -> 66.9 fps, with the frame period at
+#                                   1 ms (at the standard 33 ms it's pinned at
+#                                   30 either way); free internal RAM with the
+#                                   display up went 175,867 -> 161,295 B
+#   Waveshare LCD-7, under its remote UI: a full-screen redraw 205 -> 147 ms
+# A 36-minute Wi-Fi and TLS soak on the LCD-4.3 with these never had less than
+# 94 KB of internal RAM free.
+CONFIG_FREERTOS_HZ=1000
+CONFIG_ESP32S3_DATA_CACHE_LINE_64B=y
+CONFIG_ESP32S3_INSTRUCTION_CACHE_32KB=y
+CONFIG_ESP32S3_DATA_CACHE_64KB=y