In this project, two GIF pictures seriously affect the loading speed (two pictures account for 97.3% of the total size of the project). Therefore, it is very necessary to optimize the size of these two files.

WebP is a modern image format that provides superior lossless and lossy compression for images on the web. WebP requires fewer bytes than GIF. This is especially important on mobile networks. [1]
Meanwhile, the front-end compatibility of webp is enough to meet the requirements at present. Lossy WebP images are supported in Android 4.0 (API level 14) and higher, and lossless and transparent WebP images are supported in Android 4.3 (API level 18) and higher[2]. The WebP browser compatibility is as follows[3]:

Thus, I chose to use webp format instead of GIF file to reduce the file size.

The tool I use is ffmpeg 4.4 (encoder: Lavc58.134.100 libwebp_anim). In the transcoding process, I am mainly concerned about two parameters: compression_level and qscale. First, a series of tests are carried out on compression_level:

>ffmpeg -i bubu.gif -c:v webp -compression_level 0 bubu_c0.webp

For me, when the compression level is 5, the file size is relatively small, while the transcoding time is acceptable.

Further, I empirically take qscale as 60 to get a better file size (the default value is 75).
>ffmpeg -i bubu.gif -c:v webp -compression_level 5 -q:v 60 bubu_c5_q60.webp

The total size of the final animated images is 1.28Mb, which reduces the file size by 88% compared with the original 10.9Mb, greatly accelerating the loading of web pages.

webp_images.zip

跳转至最新计分板／跳转至最新记录

分数能够提交的标准是等效用时小于或等于3秒，即 ${\Large\frac{用时}{行数\cdot列数}\le\frac{3}{14\cdot10}}$
计分板更新状态：
（如果你发现提示上传成功但是分数却没有更新在计分板，那么有可能是计分板更新失败（比如更新计分板的程序出了问题或者长度达到限制），也有可能是和另一个上传分数的请求凑得太近而被取消了。对于前一种情况，我会手动重新添加记录；对于后一种情况，它们会被定期检查并重新运行以重新添加记录。）
计分板数据搜索：https://zrtech.org/find-keke/scoreboard
计分板二代目：#10

跳转至最新计分板／跳转至最新记录

分数能够提交的标准是等效用时小于或等于3秒，即 ${\Large\frac{用时}{行数\cdot列数}\le\frac{3}{14\cdot10}}$
计分板更新状态：
（如果你发现提示上传成功但是分数却没有更新在计分板，那么有可能是计分板更新失败（比如更新计分板的程序出了问题或者长度达到限制），也有可能是和另一个上传分数的请求凑得太近而被取消了。对于前一种情况，我会手动重新添加记录；对于后一种情况，它们会被定期检查并重新运行以重新添加记录。）
计分板数据搜索：https://zrtech.org/find-keke/scoreboard

跳转至最新计分板／跳转至最新记录

分数能够提交的标准是等效用时小于或等于3秒，即 ${\Large\frac{用时}{行数\cdot列数}\le\frac{3}{14\cdot10}}$
计分板更新状态：
（如果你发现提示上传成功但是分数却没有更新在计分板，那么有可能是计分板更新失败（比如更新计分板的程序出了问题或者长度达到限制），也有可能是和另一个上传分数的请求凑得太近而被取消了。对于前一种情况，我会手动重新添加记录；对于后一种情况，它们会被定期检查并重新运行以重新添加记录。）
计分板数据搜索：https://zrtech.org/find-keke/scoreboard
计分板一代目：#11