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まずベースラインのベンチマークを取ってみたところ以下のように結構差がありました
とりあえずallocationを減らすのはちょっといけそうかな?と思ったのでやってみたけど、以下の結果を見る限りスピードにはあまり紐付いてない感じですね。メモリは使わなくなったけど…
Tokenまわりももう少しallocationは減らせる(Token{} をreuseして、Tokens{} を使い終わったらリリース)と思ってますけど、とりあえず疲れたので一旦ここまで。少なくともWIPが取れるまでは真面目にレビューしてもらう必要はありません。