PawooでDMを送ったときのInboxesControllerの様子

gistfile1.txt

                                  |     1  | # frozen_string_literal: true
                                  |     2  |
                                  |     3  | class ActivityPub::InboxesController < Api::BaseController
                                  |     4  |   include SignatureVerification
                                  |     5  |
                                  |     6  |   before_action :set_account
                                  |     7  |
                                  |     8  |   def create
   18   (15.3%)                   |     9  |     if signed_request_account
    1    (0.8%)                   |    10  |       upgrade_account
    9    (7.6%)                   |    11  |       process_payload
    2    (1.7%)                   |    12  |       head 201
                                  |    13  |     else
                                  |    14  |       head 202
                                  |    15  |     end
                                  |    16  |   end
                                  |    17  |
                                  |    18  |   private
                                  |    19  |
                                  |    20  |   def set_account
   31   (26.3%)                   |    21  |     @account = Account.find_local!(params[:account_username]) if params[:account_username]
                                  |    22  |   end
                                  |    23  |
                                  |    24  |   def body
                                  |    25  |     @body ||= request.body.read
                                  |    26  |   end
                                  |    27  |
                                  |    28  |   def upgrade_account
    1    (0.8%)                   |    29  |     if signed_request_account.ostatus?
                                  |    30  |       signed_request_account.update(last_webfingered_at: nil)
                                  |    31  |       ResolveRemoteAccountWorker.perform_async(signed_request_account.acct)
                                  |    32  |     end
                                  |    33  |
                                  |    34  |     Pubsubhubbub::UnsubscribeWorker.perform_async(signed_request_account.id) if signed_request_account.subscribed?
                                  |    35  |   end
                                  |    36  |
                                  |    37  |   def process_payload
    9    (7.6%)                   |    38  |     ActivityPub::ProcessingWorker.perform_async(signed_request_account.id, body.force_encoding('UTF-8'))
                                  |    39  |   end
                                  |    40  | end

use StackProf::Middleware,
    enabled: ENV['ENABLE_STACKPROF'].to_i.nonzero?,
    mode: :wall,
    interval: 100,
    save_every: 1,
    path: 'tmp/stackprof'

intervalが100なので、左側の数字は1あたりだいたい0.1ミリ秒です
Account.find_local!が3ミリ秒かかってるのはだいたい合ってそう

irb(main):004:0> result = Benchmark.realtime do
irb(main):005:1* Account.find_local!('abcang')
irb(main):006:1> end
  Account Load (0.9ms)  SELECT  "accounts".* FROM "accounts" WHERE (NOT (("accounts"."username" = '' OR "accounts"."username" IS NULL))) AND LOWER("accounts"."username") = 'abcang' AND "accounts"."domain" IS NULL LIMIT $1  [["LIMIT", 1]]
=> 0.003574470989406109

ActivityPub::InboxesControllerが遅いとは思えない