diff --git a/release/tools/ec2.conf b/release/tools/ec2.conf
--- a/release/tools/ec2.conf
+++ b/release/tools/ec2.conf
@@ -38,6 +38,10 @@
 	echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
 	echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
 
+	# The EFI RNG on Graviton 2 is particularly slow if we ask for the
+	# default 2048 bytes of entropy; ask for 64 bytes instead.
+	echo 'entropy_efi_seed_size="64"' >> ${DESTDIR}/boot/loader.conf
+
 	# Tell gptboot not to wait 3 seconds for a keypress which will
 	# never arrive.
 	printf -- "-n\n" > ${DESTDIR}/boot.config