Possible perf suggestion

I wrote one of these that used the same methodology many years ago and found that object elements with no navigation context were much lighter on memory than iframes. It has been so long I am not sure if this is still the case, so take this suggestion with a grain of salt.

首先检查 repository 的 hidden-iframe 实现，以及它如何观察元素大小的变化。将现有方案与使用 object 元素的方案进行基准测试比较，然后记录内存差异是否可以复现，以及是否有必要进行更改。

由索引模型根据 Issue 内容生成。