Install Steam						
					
				
				
									login
											 | 
						language
						
																																					简体中文 (Simplified Chinese)
																													繁體中文 (Traditional Chinese)
																													日本語 (Japanese)
																													한국어 (Korean)
																													ไทย (Thai)
																													Български (Bulgarian)
																													Čeština (Czech)
																													Dansk (Danish)
																													Deutsch (German)
																																							Español - España (Spanish - Spain)
																													Español - Latinoamérica (Spanish - Latin America)
																													Ελληνικά (Greek)
																													Français (French)
																													Italiano (Italian)
																													Bahasa Indonesia (Indonesian)
																													Magyar (Hungarian)
																													Nederlands (Dutch)
																													Norsk (Norwegian)
																													Polski (Polish)
																													Português (Portuguese - Portugal)
																													Português - Brasil (Portuguese - Brazil)
																													Română (Romanian)
																													Русский (Russian)
																													Suomi (Finnish)
																													Svenska (Swedish)
																													Türkçe (Turkish)
																													Tiếng Việt (Vietnamese)
																													Українська (Ukrainian)
																									Report a translation problem
							
						
											




Could you try disabling all your addons and run the map to see if the issue still persists?
Make sure to save your current enabled ones to a preset so you don't have to re enable them all if it disabling all of them doesn't fix the problem.
Is the whole map having performance issues or a specific area of it? Did the map preform fine before and is now acting up, or has it been like this out of the box?
And if did preform well before have you installed any other addons since then?