Plots.jl/Makie.jl depends on FFmpeg for animation and other fancy features. Judging from the sizes of downloaded artifacts, FFmpeg is no light dependency and possibly takes a long time to install on a poor Internet connection.
11M artifacts/6b04ad7f71b1a29adad801f4fdd0d34b3535c638 OpenSSL_jll
1.2M artifacts/8e4e002b058fdc78ba423fc2a8725d995c8ea9cd libfdk_aac_jll
4.9M artifacts/98a8bafb73ec75070d808b170e6aedbfc2ccf474 x264_jll
6.5M artifacts/9cc8e706ab205ec16daa22d5f4a70711d5ff7885 x265_jll
792K artifacts/e76f7afca0a2695352d27f767b750e6d997fa6d4 Bzip2_jll
1.9M artifacts/6d4a696c716e1dc3c552f345367831ad6db06ee5 FreeType2_jll
4.3M artifacts/ee683986bee9f52eea1b037b791e50b2b56a6b5e LibVPX_jll
892K artifacts/770746787041f171e17fc6f94357372ffdcd7fff LAME_jll
344K artifacts/34970354470efa0ab8a80c455d13a16caec8cc7c libass_jll
372K artifacts/577d63a1594e84ca7932ceb509cfe44ab25397b1 FriBidi_jll
1.2M artifacts/7566375d010c5eabbd07b4f13631ea5f4cb6c560 libvorbis_jll
756K artifacts/758c46b63d71730edb6f652a0db1a8a09c4254a5 Ogg_jll
376K artifacts/4bec5e87202786ad751c9b3793c9cb7078c7dff5 Zlib_jll
944K artifacts/120e9425f25b2828bb99589a5532e34b6db0185e Opus_jll
27M artifacts/dbb254dca678145c7d79410e96da494cc94f8a13 FFMPEG_jll