diff --git a/backend/test-runner.js b/backend/test-runner.js
index 7b290aa..cccc686 100644
--- a/backend/test-runner.js
+++ b/backend/test-runner.js
@@ -123,7 +123,7 @@ class Test {
       timeout = setTimeout(() => {
         this.timedOut = true;
         this.handleUpdate();
-      }, TIMEOUT * 1000 * PATIENCE);
+      }, TIMEOUT * 1000 * PATIENCE * (this.config.timeoutFactor || 1));
       await session.setup();
       switch (this.type) {
         case "ensure":
diff --git a/langs/carp.yaml b/langs/carp.yaml
index 227d5bf..2929129 100644
--- a/langs/carp.yaml
+++ b/langs/carp.yaml
@@ -45,3 +45,5 @@ run: |
 scope:
   code: |
     (def x (* 123 234))
+
+timeoutFactor: 4
diff --git a/lib/jsonschema.yaml b/lib/jsonschema.yaml
index 6da6860..7bef51d 100644
--- a/lib/jsonschema.yaml
+++ b/lib/jsonschema.yaml
@@ -961,6 +961,18 @@ properties:
         type: string
         minLength: 1
 
+  timeoutFactor:
+    title: "Per-language multiplier for test timeouts"
+    description: |
+      Some languages are slow. To account for this, Riju's test
+      timeouts are fairly forgiving. However, some languages are not
+      just slow but absolutely GLACIAL. To deal with these, you can
+      specify 'timeoutFactor' as an integer multiplier for the test
+      timeout (default or user-supplied) that would otherwise be used
+      for the language.
+    type: integer
+    minimum: 1
+    default: 1
   skip:
     type: array
     items:
diff --git a/packer/provision-web.bash b/packer/provision-web.bash
index 77232f2..62a4bb1 100644
--- a/packer/provision-web.bash
+++ b/packer/provision-web.bash
@@ -55,13 +55,13 @@ sudo mv /tmp/riju.service /tmp/riju.slice /etc/systemd/system/
 sudo mv /tmp/cloudwatch.json /opt/aws/amazon-cloudwatch-agent/bin/config.json
 sudo mv /tmp/riju-init-volume /tmp/riju-supervisor /usr/local/bin/
 
-sudo sed -Ei 's/^#?PermitRootLogin .*/PermitRootLogin no/' /etc/ssh/sshd_config
-sudo sed -Ei 's/^#?PasswordAuthentication .*/PasswordAuthentication no/' /etc/ssh/sshd_config
-sudo sed -Ei 's/^#?PermitEmptyPasswords .*/PermitEmptyPasswords no/' /etc/ssh/sshd_config
-sudo sed -Ei "s/\\\$AWS_REGION/${AWS_REGION}/" /etc/systemd/system/riju.service
-sudo sed -Ei "s/\\\$FATHOM_SITE_ID/${FATHOM_SITE_ID:-}/" /etc/systemd/system/riju.service
-sudo sed -Ei "s/\\\$S3_BUCKET/${S3_BUCKET}/" /etc/systemd/system/riju.service
-sudo sed -Ei "s/\\\$SENTRY_DSN/${SENTRY_DSN:-}/" /etc/systemd/system/riju.service
+sudo sed -Ei 's|^#?PermitRootLogin .*|PermitRootLogin no|' /etc/ssh/sshd_config
+sudo sed -Ei 's|^#?PasswordAuthentication .*|PasswordAuthentication no|' /etc/ssh/sshd_config
+sudo sed -Ei 's|^#?PermitEmptyPasswords .*|PermitEmptyPasswords no|' /etc/ssh/sshd_config
+sudo sed -Ei "s|\\\$AWS_REGION|${AWS_REGION}|" /etc/systemd/system/riju.service
+sudo sed -Ei "s|\\\$FATHOM_SITE_ID|${FATHOM_SITE_ID:-}|" /etc/systemd/system/riju.service
+sudo sed -Ei "s|\\\$S3_BUCKET|${S3_BUCKET}|" /etc/systemd/system/riju.service
+sudo sed -Ei "s|\\\$SENTRY_DSN|${SENTRY_DSN:-}|" /etc/systemd/system/riju.service
 sudo sed -Ei "s|\\\$SUPERVISOR_ACCESS_TOKEN|${SUPERVISOR_ACCESS_TOKEN}|" /etc/systemd/system/riju.service
 
 sudo passwd -l root