BIP340: remove batch speedup graph and link to it instead

This avoids having to update the BIP with a fresh graph every time there's a
change to libsecp and suggests that the expected speedup depends on the specific
implementation.

1 files changed, 0 insertions, 0 deletions

diff --git a/bip-0340/speedup-batch.png b/bip-0340/speedup-batch.png
deleted file mode 100644
index fe672d4..0000000
--- a/bip-0340/speedup-batch.png
+++ /dev/null