Some portion of optimizations:

* Clear outgoing packet queue after player disconnect
* Disable sleep between chunk saving
* Put 2x4096 bytes instead 2048x4 bytes for region file aligment
* Using map to search player by name instead iterating over all players
* Some tweaks for decorations (item frames, maps)

src/main/java/org/spigotmc/CaseInsensitiveHashingStrategy.java

@@ -0,0 +1,18 @@
+package org.spigotmc;
+
+import gnu.trove.strategy.HashingStrategy;
+
+class CaseInsensitiveHashingStrategy implements HashingStrategy<String> {
+	private static final long serialVersionUID = -9212222772914758878L;
+	static final CaseInsensitiveHashingStrategy INSTANCE = new CaseInsensitiveHashingStrategy();
+
+    @Override
+    public int computeHashCode(String object) {
+        return object.toLowerCase().hashCode();
+    }
+
+    @Override
+    public boolean equals(String o1, String o2) {
+        return o1.equalsIgnoreCase(o2);
+    }
+}