[Bug]: PDF issues

### Prerequisites|前提条件

- [x] I have checked the [troubleshooting](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)|我已经查看过[故障排除](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)
- [x] I have searched for similar issues and did not find any|我已经搜索过没有相同的问题

### Describe the bug|描述问题

I recently started using Anx Reader for PDFs and idk if it's a problem on my end but PDFs are slow in this app? Like it's slow and lags a lot, also can't handle bigger PDF files. I used a different e-reader app for the pdf to see if it's really me, but the PDFs there work fine, like a normal viewer. Also TTS works in it, it just reads the chapter title and the first sentence, after that, it stalls(the file is OCR friendly) . But yea that's it. Thanks in advance!

### To reproduce|重现步骤

1. Go to '...' | 前往...
2. Click on '...' | 点击...
3. Scroll down to '...' | 向下滚动到...
4. See error | 看到错误

### Expected behavior|预期行为

I kinda just expected it to not be slow or lag. Also expected the TTS to work normally instead of just the title and first sentence

### Screenshots|截图

_No response_

### Platform (please complete the following information)|平台（请填写以下信息）

- Platform: | 平台：android

- OS: | 操作系统：Android 15

- AnxReader Version: | 安读版本：1.14.0+6321

- Device: | 设备：Redmi 12

### Additional context|其他信息

_No response_