preformance

gframe/image_manager.cpp

@@ -366,6 +366,7 @@ irr::video::ITexture* ImageManager::GetTextureThumb(int code) {
 		tThumb[code] = img;
 		return (img == NULL) ? tUnknownThumb : img;
 	}
+	if(tit == tThumb.end() || tit->second == tLoading) {
 		imageManager.tThumbLoadingMutex.lock();
 		auto lit = tThumbLoading.find(code);
 		if(lit != tThumbLoading.end()) {
@@ -382,6 +383,7 @@ irr::video::ITexture* ImageManager::GetTextureThumb(int code) {
 		}
 		imageManager.tThumbLoadingMutex.unlock();
 		tit = tThumb.find(code);
+	}
 	if(tit == tThumb.end()) {
 		tThumb[code] = tLoading;
 		imageManager.tThumbLoadingMutex.lock();