DB Query Builder updateOrInsert Vs Eloquent firstOrCreate ( Performance)

I'm using laravel mongodb and trying to import large data from json files. I tried to use Eloquent's firstOrCreate and Query Builder's updateOrInsert. I thought using query builder would be faster but it turned out that it is slower than Eloquent. Can you please help me insert data fast enough because I have millions of data left? The following is my code.

Query Builder

$ids = \Cache::remember('ids', 60 * 60, function () {
                    return array_merge(...Alert::distinct('facebookId')->get()->toArray());
                });
$chunks = array_chunk($this->data,3000);
foreach ($chunks as $posts) {
              foreach ($posts as $post) {
              if (in_array($post->account->platformId, $Ids)) {
              $likeCount = $post->statistics->actual->likeCount;
              $commentCount = $post->statistics->actual->commentCount;
              DB::collection('posts')->updateOrInsert(
               [
                  'platformId' => $post->platformId
               ],
              [ 
                 'url' => $post->postUrl,
                 'accountId' => $post->account->platformId,
                 'likes' => $likeCount, 
                  'comments' => $commentCount, 
                  'date' => $post->date ?? ''
               ]);
                        }
                    }
                }

Eloquent Builder

$ids = \Cache::remember('ids', 60 * 60, function () {
                    return array_merge(...Alert::distinct('facebookId')->get()->toArray());
                });
$chunks = array_chunk($this->data,3000);
foreach ($chunks as $posts) {
              foreach ($posts as $post) {
              if (in_array($post->account->platformId, $Ids)) {
              $likeCount = $post->likeCount;
              $commentCount = $post->commentCount;
              Post::firstOrCreate(
               [
                  'platformId' => $post->platformId
               ],
              [ 
                 'url' => $post->postUrl,
                 'accountId' => $post->account->platformId,
                 'likes' => $likeCount, 
                  'comments' => $commentCount, 
                  'date' => $post->date ?? ''
               ]);
                        }
                    }
                }