我已经编写了CSVFeedSpider，但是只要文件很大，这会花费很长时间，有人可以告诉我我需要做些什么来优化它。谢谢。
from scrapy.spiders import CSVFeedSpider
class Asos(CSVFeedSpider):
name = 'asos'
start_urls = ['https://productdata.awin.com/datafeed/download/apikey/a9c759ce97541f939fc788547cc5d9d9/'
'language/en/fid/23139/columns/aw_deep_link,product_name,aw_product_id,merchant_product_id,'
'merchant_image_url,description,merchant_category,search_price,merchant_name,merchant_id,category_name,'
'category_id,aw_image_url,currency,store_price,delivery_cost,merchant_deep_link,language,last_updated,'
'display_price,data_feed_id/format/csv/delimiter/%2C/compression/gzip/adultcontent/1/']
delimiter = ','
quotechar = "\""
headers = ["aw_deep_link","product_name","aw_product_id","merchant_product_id","merchant_image_url",
"description","merchant_category","search_price","merchant_name","merchant_id","category_name",
"category_id","aw_image_url","currency","store_price","delivery_cost","merchant_deep_link","language",
"last_updated","display_price","data_feed_id"]
def parse_row(self, response, row):
print(row["product_name"], row["aw_deep_link"])