From 100578a9e958c6ed5f8f6d64020a37ff24d060a2 Mon Sep 17 00:00:00 2001
From: Angus Gratton <angus@espressif.com>
Date: Thu, 2 Apr 2020 16:32:45 +1100
Subject: [PATCH] heap: Only fill new heaps with FREE_FILL_PATTERN if
 Comprehensive poisoning is on

Significantly speeds up heap initialization at startup when default "Light" heap
poisoning is enabled.

Tip via reddit user LinkeSeitentasche https://www.reddit.com/r/esp32/comments/fnj51a/a_guide_to_improving_esp32_boot_speed/
---
 components/heap/multi_heap_poisoning.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/heap/multi_heap_poisoning.c b/components/heap/multi_heap_poisoning.c
index ec620c079..9a9d739ad 100644
--- a/components/heap/multi_heap_poisoning.c
+++ b/components/heap/multi_heap_poisoning.c
@@ -355,9 +355,11 @@ void *multi_heap_get_block_owner(multi_heap_block_handle_t block)
 
 multi_heap_handle_t multi_heap_register(void *start, size_t size)
 {
+#ifdef SLOW
     if (start != NULL) {
         memset(start, FREE_FILL_PATTERN, size);
     }
+#endif
     return multi_heap_register_impl(start, size);
 }