I want to search a block with specific property set to some value. This is my code:

 var contentRepo = ServiceLocator.Current.GetInstance<IContentRepository>();

            var allBlocks = contentRepo.GetDescendents(ContentReference.SiteBlockFolder);
            
            foreach (var block in allBlocks)
            {
                var content = contentRepo.Get<BlockData>(block);
                var subStepBlock = content as CertificationSubStepBlock;
                if (subStepBlock != null)
                {
                    if (subStepBlock.Code == code)
                    {
                        return subStepBlock;
                    }
                }
            }

I am caching this, but is there a way to improve performances by search from specific block folder ID on? How would I see the ID of the folder in edit mode?