尝试调整 CONCURRENT_ITEMS、CONCURRENT_REQUESTS、CONCURRENT_REQUESTS_PER_DOMAIN 和其他设置.

Try tuning the CONCURRENT_ITEMS, CONCURRENT_REQUESTS, CONCURRENT_REQUESTS_PER_DOMAIN and other settings.

有关设置的完整列表，请参阅 http://doc.scrapy.org/en/latest/topics/settings.html

For full list of settings, see http://doc.scrapy.org/en/latest/topics/settings.html