From a9fa06f0192bd767fc6d323921cdb62232d967d1 Mon Sep 17 00:00:00 2001
From: Nicolas F <ovdev@fratti.ch>
Date: Thu, 26 Dec 2019 17:28:51 +0100
Subject: [PATCH] nbt: small optimisation to list reading

Don't use .append(), we already know the final length. Instead,
have python initialise the list of a certain size and set the elements
in it.

Makes the function like 4% faster.
---
 overviewer_core/nbt.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/overviewer_core/nbt.py b/overviewer_core/nbt.py
index cbb6c71..7a8ee46 100644
--- a/overviewer_core/nbt.py
+++ b/overviewer_core/nbt.py
@@ -167,9 +167,9 @@ class NBTFileReader(object):
         length = self._uint.unpack(self._file.read(4))[0]
 
         read_method = self._read_tagmap[tagid]
-        l = []
-        for _ in range(length):
-            l.append(read_method())
+        l = [None] * length
+        for i in range(length):
+            l[i] = read_method()
         return l
 
     def _read_tag_compound(self):