Rails的時間超出預期加載頁面

完成200 OK在879ms（瀏覽次數：57.5ms | ActiveRecord的：的3.2ms）

正如你所看到的景色加載時間和主動記錄時間大約需要60ms。但相反，加載時間是879毫秒。其他800毫秒可以歸於哪裏？（有時其高達2000毫秒）

完整跟蹤

Started GET "/index" for 127.0.0.1 at 2017-03-17 02:10:13 +0200 
Processing by HomeController#index as HTML 
    User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT 1 [["id", 2]] 
    User Exists (0.6ms) SELECT 1 AS one FROM "users" WHERE ("users"."firstname" = 'Andr' AND "users"."id" != 2 AND "users"."is_artist" = 't') LIMIT 1 
    User Exists (0.4ms) SELECT 1 AS one FROM "users" WHERE ("users"."cname" = 'chic' AND "users"."id" != 2 AND "users"."is_artist" = 't') LIMIT 1 
    User Exists (0.4ms) SELECT 1 AS one FROM "users" WHERE ("users"."email" = '[email protected]' AND "users"."id" != 2 AND "users"."is_artist" = 't') LIMIT 1 
    User Exists (0.4ms) SELECT 1 AS one FROM "users" WHERE ("users"."spotify_name" = 'nickelback' AND "users"."id" != 2 AND "users"."is_artist" = 't') LIMIT 1 
    User Exists (0.2ms) SELECT 1 AS one FROM "users" WHERE ("users"."soundcloud_link" = 'nickelback' AND "users"."id" != 2 AND "users"."is_artist" = 't') LIMIT 1 
    Rendered layouts/_search_bar.html.erb (0.3ms) 
    User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."is_artist" = $1 [["is_artist", "t"]] 
    Tagging Load (0.4ms) SELECT "taggings".* FROM "taggings" WHERE "taggings"."user_id" IN (1, 2) 
    Tag Load (0.3ms) SELECT "tags".* FROM "tags" WHERE "tags"."id" IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30) 
    Rendered shared/_artist_tile.html.erb (3.4ms) 
    Rendered shared/_artist_tile.html.erb (1.6ms) 
    Rendered shared/_artist_tile.html.erb (1.6ms) 
    Rendered home/index.html.erb within layouts/application (17.6ms) 
    (0.2ms) SELECT COUNT(*) FROM "collective_requests" WHERE "collective_requests"."receiver_id" = $1 AND "collective_requests"."accepted" IS NULL [["receiver_id", 2]] 
    CACHE (0.0ms) SELECT COUNT(*) FROM "collective_requests" WHERE "collective_requests"."receiver_id" = $1 AND "collective_requests"."accepted" IS NULL [["receiver_id", 2]] 
    Rendered layouts/_navlinks.html.erb (3.1ms) 
    Rendered layouts/_header.html.erb (4.8ms) 
    Rendered layouts/_footer.html.erb (1.1ms) 
Completed 200 OK in 879ms (Views: 57.5ms | ActiveRecord: 3.2ms)

Rails的版本是4.2.6

來源

2017-03-17 Petros Kyriakou