add RTF performence

add RTF performence

README.md

@@ -43,6 +43,11 @@ Unseen speakers few-shot fine-tuning demo:
 
 https://github.com/RVC-Boss/GPT-SoVITS/assets/129054828/05bee1fa-bdd8-4d85-9350-80c060ab47fb
 
+**RTF(inference speed) of GPT-SoVITS**:
+0.028 tested in 4060Ti, 0.014 tested in 4090. You can test our [huggingface demo](https://lj1995-gpt-sovits-proplus.hf.space/) (half H200) to experience high-speed inference .
+
+请不要尬黑GPT-SoVITS推理速度慢，谢谢！
+
 **User guide: [简体中文](https://www.yuque.com/baicaigongchang1145haoyuangong/ib3g1e) | [English](https://rentry.co/GPT-SoVITS-guide#/)**
 
 ## Installation