diff --git a/dist-build/emscripten.sh b/dist-build/emscripten.sh
index 96834bfd..cf2f1bd9 100755
--- a/dist-build/emscripten.sh
+++ b/dist-build/emscripten.sh
@@ -4,7 +4,12 @@ export MAKE_FLAGS='-j4'
 export EXPORTED_FUNCTIONS_STANDARD='["_crypto_aead_chacha20poly1305_abytes","_crypto_aead_chacha20poly1305_decrypt","_crypto_aead_chacha20poly1305_decrypt_detached","_crypto_aead_chacha20poly1305_encrypt","_crypto_aead_chacha20poly1305_encrypt_detached","_crypto_aead_chacha20poly1305_ietf_abytes","_crypto_aead_chacha20poly1305_ietf_decrypt","_crypto_aead_chacha20poly1305_ietf_decrypt_detached","_crypto_aead_chacha20poly1305_ietf_encrypt","_crypto_aead_chacha20poly1305_ietf_encrypt_detached","_crypto_aead_chacha20poly1305_ietf_keybytes","_crypto_aead_chacha20poly1305_ietf_npubbytes","_crypto_aead_chacha20poly1305_ietf_nsecbytes","_crypto_aead_chacha20poly1305_keybytes","_crypto_aead_chacha20poly1305_npubbytes","_crypto_aead_chacha20poly1305_nsecbytes","_crypto_auth","_crypto_auth_bytes","_crypto_auth_keybytes","_crypto_auth_verify","_crypto_box_beforenm","_crypto_box_beforenmbytes","_crypto_box_detached","_crypto_box_detached_afternm","_crypto_box_easy","_crypto_box_easy_afternm","_crypto_box_keypair","_crypto_box_macbytes","_crypto_box_noncebytes","_crypto_box_open_detached","_crypto_box_open_detached_afternm","_crypto_box_open_easy","_crypto_box_open_easy_afternm","_crypto_box_publickeybytes","_crypto_box_seal","_crypto_box_seal_open","_crypto_box_sealbytes","_crypto_box_secretkeybytes","_crypto_box_seed_keypair","_crypto_box_seedbytes","_crypto_generichash","_crypto_generichash_bytes","_crypto_generichash_bytes_max","_crypto_generichash_bytes_min","_crypto_generichash_final","_crypto_generichash_init","_crypto_generichash_keybytes","_crypto_generichash_keybytes_max","_crypto_generichash_keybytes_min","_crypto_generichash_primitive","_crypto_generichash_statebytes","_crypto_generichash_update","_crypto_hash","_crypto_hash_bytes","_crypto_pwhash","_crypto_pwhash_alg_argon2i13","_crypto_pwhash_alg_default","_crypto_pwhash_memlimit_interactive","_crypto_pwhash_memlimit_moderate","_crypto_pwhash_memlimit_sensitive","_crypto_pwhash_opslimit_interactive","_crypto_pwhash_opslimit_moderate","_crypto_pwhash_opslimit_sensitive","_crypto_pwhash_saltbytes","_crypto_pwhash_scryptsalsa208sha256","_crypto_pwhash_scryptsalsa208sha256_ll","_crypto_pwhash_scryptsalsa208sha256_memlimit_interactive","_crypto_pwhash_scryptsalsa208sha256_memlimit_sensitive","_crypto_pwhash_scryptsalsa208sha256_opslimit_interactive","_crypto_pwhash_scryptsalsa208sha256_opslimit_sensitive","_crypto_pwhash_scryptsalsa208sha256_saltbytes","_crypto_pwhash_scryptsalsa208sha256_str","_crypto_pwhash_scryptsalsa208sha256_str_verify","_crypto_pwhash_scryptsalsa208sha256_strbytes","_crypto_pwhash_scryptsalsa208sha256_strprefix","_crypto_pwhash_str","_crypto_pwhash_str_verify","_crypto_pwhash_strbytes","_crypto_pwhash_strprefix","_crypto_scalarmult","_crypto_scalarmult_base","_crypto_scalarmult_bytes","_crypto_scalarmult_scalarbytes","_crypto_secretbox_detached","_crypto_secretbox_easy","_crypto_secretbox_keybytes","_crypto_secretbox_macbytes","_crypto_secretbox_noncebytes","_crypto_secretbox_open_detached","_crypto_secretbox_open_easy","_crypto_shorthash","_crypto_shorthash_bytes","_crypto_shorthash_keybytes","_crypto_sign","_crypto_sign_bytes","_crypto_sign_detached","_crypto_sign_ed25519_pk_to_curve25519","_crypto_sign_ed25519_sk_to_curve25519","_crypto_sign_keypair","_crypto_sign_open","_crypto_sign_publickeybytes","_crypto_sign_secretkeybytes","_crypto_sign_seed_keypair","_crypto_sign_seedbytes","_crypto_sign_verify_detached","_randombytes","_randombytes_buf","_randombytes_close","_randombytes_random","_randombytes_stir","_randombytes_uniform","_sodium_bin2hex","_sodium_hex2bin","_sodium_init","_sodium_library_version_major","_sodium_library_version_minor","_sodium_version_string"]'
 export EXPORTED_FUNCTIONS_SUMO='["_crypto_aead_chacha20poly1305_abytes","_crypto_aead_chacha20poly1305_decrypt","_crypto_aead_chacha20poly1305_decrypt_detached","_crypto_aead_chacha20poly1305_encrypt","_crypto_aead_chacha20poly1305_encrypt_detached","_crypto_aead_chacha20poly1305_ietf_abytes","_crypto_aead_chacha20poly1305_ietf_decrypt","_crypto_aead_chacha20poly1305_ietf_decrypt_detached","_crypto_aead_chacha20poly1305_ietf_encrypt","_crypto_aead_chacha20poly1305_ietf_encrypt_detached","_crypto_aead_chacha20poly1305_ietf_keybytes","_crypto_aead_chacha20poly1305_ietf_npubbytes","_crypto_aead_chacha20poly1305_ietf_nsecbytes","_crypto_aead_chacha20poly1305_keybytes","_crypto_aead_chacha20poly1305_npubbytes","_crypto_aead_chacha20poly1305_nsecbytes","_crypto_auth","_crypto_auth_bytes","_crypto_auth_hmacsha256","_crypto_auth_hmacsha256_bytes","_crypto_auth_hmacsha256_final","_crypto_auth_hmacsha256_init","_crypto_auth_hmacsha256_keybytes","_crypto_auth_hmacsha256_statebytes","_crypto_auth_hmacsha256_update","_crypto_auth_hmacsha256_verify","_crypto_auth_hmacsha512","_crypto_auth_hmacsha512256","_crypto_auth_hmacsha512256_bytes","_crypto_auth_hmacsha512256_final","_crypto_auth_hmacsha512256_init","_crypto_auth_hmacsha512256_keybytes","_crypto_auth_hmacsha512256_statebytes","_crypto_auth_hmacsha512256_update","_crypto_auth_hmacsha512256_verify","_crypto_auth_hmacsha512_bytes","_crypto_auth_hmacsha512_final","_crypto_auth_hmacsha512_init","_crypto_auth_hmacsha512_keybytes","_crypto_auth_hmacsha512_statebytes","_crypto_auth_hmacsha512_update","_crypto_auth_hmacsha512_verify","_crypto_auth_keybytes","_crypto_auth_verify","_crypto_box","_crypto_box_afternm","_crypto_box_beforenm","_crypto_box_beforenmbytes","_crypto_box_boxzerobytes","_crypto_box_curve25519xsalsa20poly1305","_crypto_box_curve25519xsalsa20poly1305_afternm","_crypto_box_curve25519xsalsa20poly1305_beforenm","_crypto_box_curve25519xsalsa20poly1305_beforenmbytes","_crypto_box_curve25519xsalsa20poly1305_boxzerobytes","_crypto_box_curve25519xsalsa20poly1305_keypair","_crypto_box_curve25519xsalsa20poly1305_macbytes","_crypto_box_curve25519xsalsa20poly1305_noncebytes","_crypto_box_curve25519xsalsa20poly1305_open","_crypto_box_curve25519xsalsa20poly1305_open_afternm","_crypto_box_curve25519xsalsa20poly1305_publickeybytes","_crypto_box_curve25519xsalsa20poly1305_secretkeybytes","_crypto_box_curve25519xsalsa20poly1305_seed_keypair","_crypto_box_curve25519xsalsa20poly1305_seedbytes","_crypto_box_curve25519xsalsa20poly1305_zerobytes","_crypto_box_detached","_crypto_box_detached_afternm","_crypto_box_easy","_crypto_box_easy_afternm","_crypto_box_keypair","_crypto_box_macbytes","_crypto_box_noncebytes","_crypto_box_open","_crypto_box_open_afternm","_crypto_box_open_detached","_crypto_box_open_detached_afternm","_crypto_box_open_easy","_crypto_box_open_easy_afternm","_crypto_box_primitive","_crypto_box_publickeybytes","_crypto_box_seal","_crypto_box_seal_open","_crypto_box_sealbytes","_crypto_box_secretkeybytes","_crypto_box_seed_keypair","_crypto_box_seedbytes","_crypto_box_zerobytes","_crypto_core_hsalsa20","_crypto_core_hsalsa20_constbytes","_crypto_core_hsalsa20_inputbytes","_crypto_core_hsalsa20_keybytes","_crypto_core_hsalsa20_outputbytes","_crypto_core_salsa20","_crypto_core_salsa20_constbytes","_crypto_core_salsa20_inputbytes","_crypto_core_salsa20_keybytes","_crypto_core_salsa20_outputbytes","_crypto_generichash","_crypto_generichash_blake2b","_crypto_generichash_blake2b_bytes","_crypto_generichash_blake2b_bytes_max","_crypto_generichash_blake2b_bytes_min","_crypto_generichash_blake2b_final","_crypto_generichash_blake2b_init","_crypto_generichash_blake2b_init_salt_personal","_crypto_generichash_blake2b_keybytes","_crypto_generichash_blake2b_keybytes_max","_crypto_generichash_blake2b_keybytes_min","_crypto_generichash_blake2b_personalbytes","_crypto_generichash_blake2b_salt_personal","_crypto_generichash_blake2b_saltbytes","_crypto_generichash_blake2b_statebytes","_crypto_generichash_blake2b_update","_crypto_generichash_bytes","_crypto_generichash_bytes_max","_crypto_generichash_bytes_min","_crypto_generichash_final","_crypto_generichash_init","_crypto_generichash_keybytes","_crypto_generichash_keybytes_max","_crypto_generichash_keybytes_min","_crypto_generichash_primitive","_crypto_generichash_statebytes","_crypto_generichash_update","_crypto_hash","_crypto_hash_bytes","_crypto_hash_primitive","_crypto_hash_sha256","_crypto_hash_sha256_bytes","_crypto_hash_sha256_final","_crypto_hash_sha256_init","_crypto_hash_sha256_statebytes","_crypto_hash_sha256_update","_crypto_hash_sha512","_crypto_hash_sha512_bytes","_crypto_hash_sha512_final","_crypto_hash_sha512_init","_crypto_hash_sha512_statebytes","_crypto_hash_sha512_update","_crypto_onetimeauth","_crypto_onetimeauth_bytes","_crypto_onetimeauth_final","_crypto_onetimeauth_init","_crypto_onetimeauth_keybytes","_crypto_onetimeauth_poly1305","_crypto_onetimeauth_poly1305_bytes","_crypto_onetimeauth_poly1305_final","_crypto_onetimeauth_poly1305_init","_crypto_onetimeauth_poly1305_keybytes","_crypto_onetimeauth_poly1305_update","_crypto_onetimeauth_poly1305_verify","_crypto_onetimeauth_primitive","_crypto_onetimeauth_statebytes","_crypto_onetimeauth_update","_crypto_onetimeauth_verify","_crypto_pwhash","_crypto_pwhash_alg_argon2i13","_crypto_pwhash_alg_default","_crypto_pwhash_argon2i","_crypto_pwhash_argon2i_alg_argon2i13","_crypto_pwhash_argon2i_memlimit_interactive","_crypto_pwhash_argon2i_memlimit_moderate","_crypto_pwhash_argon2i_memlimit_sensitive","_crypto_pwhash_argon2i_opslimit_interactive","_crypto_pwhash_argon2i_opslimit_moderate","_crypto_pwhash_argon2i_opslimit_sensitive","_crypto_pwhash_argon2i_saltbytes","_crypto_pwhash_argon2i_str","_crypto_pwhash_argon2i_str_verify","_crypto_pwhash_argon2i_strbytes","_crypto_pwhash_argon2i_strprefix","_crypto_pwhash_memlimit_interactive","_crypto_pwhash_memlimit_moderate","_crypto_pwhash_memlimit_sensitive","_crypto_pwhash_opslimit_interactive","_crypto_pwhash_opslimit_moderate","_crypto_pwhash_opslimit_sensitive","_crypto_pwhash_primitive","_crypto_pwhash_saltbytes","_crypto_pwhash_scryptsalsa208sha256","_crypto_pwhash_scryptsalsa208sha256_ll","_crypto_pwhash_scryptsalsa208sha256_memlimit_interactive","_crypto_pwhash_scryptsalsa208sha256_memlimit_sensitive","_crypto_pwhash_scryptsalsa208sha256_opslimit_interactive","_crypto_pwhash_scryptsalsa208sha256_opslimit_sensitive","_crypto_pwhash_scryptsalsa208sha256_saltbytes","_crypto_pwhash_scryptsalsa208sha256_str","_crypto_pwhash_scryptsalsa208sha256_str_verify","_crypto_pwhash_scryptsalsa208sha256_strbytes","_crypto_pwhash_scryptsalsa208sha256_strprefix","_crypto_pwhash_str","_crypto_pwhash_str_verify","_crypto_pwhash_strbytes","_crypto_pwhash_strprefix","_crypto_scalarmult","_crypto_scalarmult_base","_crypto_scalarmult_bytes","_crypto_scalarmult_curve25519","_crypto_scalarmult_curve25519_base","_crypto_scalarmult_curve25519_bytes","_crypto_scalarmult_curve25519_scalarbytes","_crypto_scalarmult_primitive","_crypto_scalarmult_scalarbytes","_crypto_secretbox","_crypto_secretbox_boxzerobytes","_crypto_secretbox_detached","_crypto_secretbox_easy","_crypto_secretbox_keybytes","_crypto_secretbox_macbytes","_crypto_secretbox_noncebytes","_crypto_secretbox_open","_crypto_secretbox_open_detached","_crypto_secretbox_open_easy","_crypto_secretbox_primitive","_crypto_secretbox_xsalsa20poly1305","_crypto_secretbox_xsalsa20poly1305_boxzerobytes","_crypto_secretbox_xsalsa20poly1305_keybytes","_crypto_secretbox_xsalsa20poly1305_macbytes","_crypto_secretbox_xsalsa20poly1305_noncebytes","_crypto_secretbox_xsalsa20poly1305_open","_crypto_secretbox_xsalsa20poly1305_zerobytes","_crypto_secretbox_zerobytes","_crypto_shorthash","_crypto_shorthash_bytes","_crypto_shorthash_keybytes","_crypto_shorthash_primitive","_crypto_shorthash_siphash24","_crypto_shorthash_siphash24_bytes","_crypto_shorthash_siphash24_keybytes","_crypto_sign","_crypto_sign_bytes","_crypto_sign_detached","_crypto_sign_ed25519","_crypto_sign_ed25519_bytes","_crypto_sign_ed25519_detached","_crypto_sign_ed25519_keypair","_crypto_sign_ed25519_open","_crypto_sign_ed25519_pk_to_curve25519","_crypto_sign_ed25519_publickeybytes","_crypto_sign_ed25519_secretkeybytes","_crypto_sign_ed25519_seed_keypair","_crypto_sign_ed25519_seedbytes","_crypto_sign_ed25519_sk_to_curve25519","_crypto_sign_ed25519_sk_to_pk","_crypto_sign_ed25519_sk_to_seed","_crypto_sign_ed25519_verify_detached","_crypto_sign_keypair","_crypto_sign_open","_crypto_sign_primitive","_crypto_sign_publickeybytes","_crypto_sign_secretkeybytes","_crypto_sign_seed_keypair","_crypto_sign_seedbytes","_crypto_sign_verify_detached","_crypto_stream","_crypto_stream_chacha20","_crypto_stream_chacha20_ietf","_crypto_stream_chacha20_ietf_noncebytes","_crypto_stream_chacha20_ietf_xor","_crypto_stream_chacha20_ietf_xor_ic","_crypto_stream_chacha20_keybytes","_crypto_stream_chacha20_noncebytes","_crypto_stream_chacha20_xor","_crypto_stream_chacha20_xor_ic","_crypto_stream_keybytes","_crypto_stream_noncebytes","_crypto_stream_primitive","_crypto_stream_salsa20","_crypto_stream_salsa20_keybytes","_crypto_stream_salsa20_noncebytes","_crypto_stream_salsa20_xor","_crypto_stream_salsa20_xor_ic","_crypto_stream_xor","_crypto_stream_xsalsa20","_crypto_stream_xsalsa20_keybytes","_crypto_stream_xsalsa20_noncebytes","_crypto_stream_xsalsa20_xor","_crypto_stream_xsalsa20_xor_ic","_crypto_verify_16","_crypto_verify_16_bytes","_crypto_verify_32","_crypto_verify_32_bytes","_crypto_verify_64","_crypto_verify_64_bytes","_randombytes","_randombytes_buf","_randombytes_close","_randombytes_implementation_name","_randombytes_random","_randombytes_stir","_randombytes_uniform","_sodium_bin2hex","_sodium_hex2bin","_sodium_init","_sodium_library_version_major","_sodium_library_version_minor","_sodium_version_string"]'
 export TOTAL_MEMORY=50000000
-export LDFLAGS="-s TOTAL_MEMORY=${TOTAL_MEMORY} -s RESERVED_FUNCTION_POINTERS=8 -s NO_DYNAMIC_EXECUTION=1 -s RUNNING_JS_OPTS=1"
+export LDFLAGS="-s TOTAL_MEMORY=${TOTAL_MEMORY} -s RESERVED_FUNCTION_POINTERS=8"
+export LDFLAGS="${LDFLAGS} -s NO_DYNAMIC_EXECUTION=1 -s RUNNING_JS_OPTS=1 -s ASSERTIONS=0"
+export LDFLAGS="${LDFLAGS} -s AGGRESSIVE_VARIABLE_ELIMINATION=1 -s ALIASING_FUNCTION_POINTERS=1"
+export LDFLAGS="${LDFLAGS} -s FUNCTION_POINTER_ALIGNMENT=1 -s DISABLE_EXCEPTION_CATCHING=1"
+export LDFLAGS="${LDFLAGS} -s ELIMINATE_DUPLICATE_FUNCTIONS=1"
+export CFLAGS="-Os"
 
 export EXPORTED_FUNCTIONS="$EXPORTED_FUNCTIONS_STANDARD"
 if [ "x$1" = "x--sumo" ]; then
@@ -28,10 +33,10 @@ fi
 rm -f "$DONE_FILE"
 
 emconfigure ./configure --enable-minimal --disable-shared --prefix="$PREFIX" \
-  CFLAGS="-O3" && \
+  CFLAGS="$CFLAGS" && \
 emmake make clean && \
 emmake make $MAKE_FLAGS install V=1 && \
-emcc -O3 --llvm-lto 1 --memory-init-file 0 $CPPFLAGS $LDFLAGS $JS_EXPORTS_FLAGS \
+emcc "$CFLAGS" --llvm-lto 1 --memory-init-file 0 $CPPFLAGS $LDFLAGS $JS_EXPORTS_FLAGS \
   "${PREFIX}/lib/libsodium.a" -o "${PREFIX}/lib/libsodium.js" || exit 1
 
 if test "x$NODE" = x; then
@@ -86,7 +91,7 @@ else
       mv -f "${file}.tmp" "$file"
     done
   )
-  make $MAKE_FLAGS check || exit 1
+  time make $MAKE_FLAGS check || exit 1
   touch -r "${PREFIX}/lib/libsodium.js" "$DONE_FILE"
 fi