diff --git a/Cargo.lock b/Cargo.lock
index b9e1fba0f..df20db785 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -202,8 +202,9 @@ checksum = "809e18805660d7b6b2e2b9f316a5099521b5998d5cba4dda11b5157a21aaef03"
 [[package]]
 name = "hvm-core"
 version = "0.2.19"
-source = "git+https://github.com/HigherOrderCO/hvm-core#c1f123210d1e918dfce12060c7f4b57b602bb02c"
+source = "git+https://github.com/HigherOrderCO/hvm-core#0433f52cd51f3b9c8db3630bf338d378d5b2908d"
 dependencies = [
+ "clap",
  "nohash-hasher",
 ]
 
diff --git a/cspell.json b/cspell.json
index 7bd1f52e8..495185188 100644
--- a/cspell.json
+++ b/cspell.json
@@ -48,7 +48,6 @@
     "oprune",
     "oref",
     "postcondition",
-    "rdex",
     "redex",
     "redexes",
     "readback",
diff --git a/src/hvmc_net/pre_reduce.rs b/src/hvmc_net/pre_reduce.rs
index f2606b66a..2f4e4e831 100644
--- a/src/hvmc_net/pre_reduce.rs
+++ b/src/hvmc_net/pre_reduce.rs
@@ -41,11 +41,11 @@ pub fn pre_reduce_book(book: &mut Book, entrypoint: &str) -> Result<(), String>
 
   for (nam, net) in book.iter_mut() {
     // Skip unnecessary work
-    if net.rdex.is_empty() || *nam == entrypoint {
+    if net.redexes.is_empty() || *nam == entrypoint {
       continue;
     }
 
-    let area = hvmc::run::Net::<hvmc::run::Lazy>::init_heap(1 << 18);
+    let area = hvmc::run::Heap::new_words(1 << 18);
     let mut rt = hvmc::run::DynNet::new(&area, false);
     dispatch_dyn_net!(&mut rt => {
       rt.boot(host.defs.get(nam).expect("No function."));
@@ -53,12 +53,12 @@ pub fn pre_reduce_book(book: &mut Book, entrypoint: &str) -> Result<(), String>
       rt.reduce(MAX_RWTS);
     });
 
-    // Move interactions with inert defs back into the net rdex array
+    // Move interactions with inert defs back into the net redexes array
     for def in host.defs.values() {
       if let Some(def) = def.downcast_ref::<InertDef>() {
         let mut stored_redexes = def.data.0.lock().unwrap();
         dispatch_dyn_net!(&mut rt => {
-          rt.rdex.extend(core::mem::take(&mut *stored_redexes));
+          rt.redexes.extend(core::mem::take(&mut *stored_redexes));
         })
       }
     }
diff --git a/src/hvmc_net/prune.rs b/src/hvmc_net/prune.rs
index a5af93944..76d4904a0 100644
--- a/src/hvmc_net/prune.rs
+++ b/src/hvmc_net/prune.rs
@@ -11,7 +11,7 @@ pub fn prune_defs(book: &mut Book, entrypoint: String) {
   while let Some(nam) = to_visit.pop() {
     let def = &book[&nam];
     used_defs_in_tree(&def.root, &mut used_defs, &mut to_visit);
-    for (a, b) in &def.rdex {
+    for (a, b) in &def.redexes {
       used_defs_in_tree(a, &mut used_defs, &mut to_visit);
       used_defs_in_tree(b, &mut used_defs, &mut to_visit);
     }
diff --git a/src/lib.rs b/src/lib.rs
index fff01d99f..df68be3ce 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@ use hvmc::{
   ast::{self, Net},
   dispatch_dyn_net,
   host::Host,
-  run::{DynNet, Net as RtNet, Rewrites},
+  run::{DynNet, Heap, Rewrites},
   stdlib::LogDef,
 };
 use hvmc_net::{pre_reduce::pre_reduce_book, prune::prune_defs};
@@ -53,7 +53,7 @@ pub fn create_host(book: Arc<Book>, labels: Arc<Labels>, compile_opts: CompileOp
       move |wire| {
         let host = host.lock().unwrap();
         let tree = host.readback_tree(&wire);
-        let net = hvmc::ast::Net { root: tree, rdex: vec![] };
+        let net = hvmc::ast::Net { root: tree, redexes: vec![] };
         let net = hvmc_to_net(&net);
         let (mut term, mut readback_errors) = net_to_term(&net, &book, &labels, false);
         let resugar_errs = term.resugar_adts(&book, compile_opts.adt_encoding);
@@ -73,7 +73,7 @@ pub fn create_host(book: Arc<Book>, labels: Arc<Labels>, compile_opts: CompileOp
       move |wire| {
         let host = host.lock().unwrap();
         let tree = host.readback_tree(&wire);
-        let net = hvmc::ast::Net { root: tree, rdex: vec![] };
+        let net = hvmc::ast::Net { root: tree, redexes: vec![] };
         let net = hvmc_to_net(&net);
         let (mut term, mut readback_errors) = net_to_term(&net, &book, &labels, false);
         let resugar_errs = term.resugar_adts(&book, compile_opts.adt_encoding);
@@ -217,7 +217,7 @@ pub fn run_book(
 pub fn count_nodes<'l>(net: &'l hvmc::ast::Net) -> usize {
   let mut visit: Vec<&'l hvmc::ast::Tree> = vec![&net.root];
   let mut count = 0usize;
-  for (l, r) in &net.rdex {
+  for (l, r) in &net.redexes {
     visit.push(l);
     visit.push(r);
   }
@@ -253,7 +253,7 @@ pub fn run_compiled(
   hook: Option<impl FnMut(&Net)>,
   entrypoint: &str,
 ) -> (Net, RunStats) {
-  let heap = RtNet::<hvmc::run::Lazy>::init_heap(mem_size);
+  let heap = Heap::new_bytes(mem_size);
   let mut root = DynNet::new(&heap, run_opts.lazy_mode);
   let max_rwts = run_opts.max_rewrites.map(|x| x.clamp(usize::MIN as u64, usize::MAX as u64) as usize);
   // Expect won't be reached because there's
@@ -265,7 +265,7 @@ pub fn run_compiled(
 
     if let Some(mut hook) = hook {
       root.expand();
-      while !root.rdex.is_empty() {
+      while !root.redexes.is_empty() {
         hook(&host.lock().unwrap().readback(root));
         root.reduce(1);
         root.expand();
@@ -278,7 +278,7 @@ pub fn run_compiled(
         panic!("Parallel mode does not yet support rewrite limit");
       }
       root.expand();
-      while !root.rdex.is_empty() {
+      while !root.redexes.is_empty() {
         let old_rwts = root.rwts.total();
         root.reduce(max_rwts);
         let delta_rwts = root.rwts.total() - old_rwts;
diff --git a/src/main.rs b/src/main.rs
index 6afe45f8e..7f4f5d2a7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -232,9 +232,8 @@ fn execute_cli_mode(mut cli: Cli) -> Result<(), Info> {
 
       let book = load_book(&path)?;
 
-      let mem_size = max_mem / std::mem::size_of::<hvmc::run::Node>() as u64;
       let run_opts =
-        RunOpts { single_core, debug, linear, lazy_mode, max_memory: mem_size, max_rewrites: max_rwts };
+        RunOpts { single_core, debug, linear, lazy_mode, max_memory: max_mem, max_rewrites: max_rwts };
       let (res_term, RunInfo { stats, readback_errors, net, book: _, labels: _ }) =
         run_book(book, max_mem as usize, run_opts, warning_opts, opts)?;
 
diff --git a/src/net/hvmc_to_net.rs b/src/net/hvmc_to_net.rs
index 6968f1989..2257580f5 100644
--- a/src/net/hvmc_to_net.rs
+++ b/src/net/hvmc_to_net.rs
@@ -18,7 +18,7 @@ fn hvmc_to_inodes(net: &Net) -> INodes {
     inodes.append(&mut root);
   }
   // Convert all the trees forming active pairs.
-  for (i, (tree1, tree2)) in net.rdex.iter().enumerate() {
+  for (i, (tree1, tree2)) in net.redexes.iter().enumerate() {
     let tree_root = format!("a{i}");
     let mut tree1 = tree_to_inodes(tree1, tree_root.clone(), net_root, &mut n_vars);
     inodes.append(&mut tree1);
diff --git a/src/net/net_to_hvmc.rs b/src/net/net_to_hvmc.rs
index 917da0b6d..8eeefb164 100644
--- a/src/net/net_to_hvmc.rs
+++ b/src/net/net_to_hvmc.rs
@@ -16,7 +16,7 @@ pub fn nets_to_hvmc(nets: HashMap<String, INet>) -> Result<Book, String> {
 
 /// Convert an inet-encoded definition into an hvmc AST inet.
 pub fn net_to_hvmc(inet: &INet) -> Result<Net, String> {
-  let (net_root, redexes) = get_tree_roots(inet)?;
+  let (net_root, net_redexes) = get_tree_roots(inet)?;
   let mut port_to_var_id: HashMap<Port, VarId> = HashMap::new();
   let root = if let Some(net_root) = net_root {
     // If there is a root tree connected to the root node
@@ -26,13 +26,13 @@ pub fn net_to_hvmc(inet: &INet) -> Result<Net, String> {
     port_to_var_id.insert(inet.enter_port(ROOT), 0);
     Tree::Var { nam: num_to_name(0) }
   };
-  let mut rdex = vec![];
-  for [root0, root1] in redexes {
-    let rdex0 = net_tree_to_hvmc_tree(inet, root0, &mut port_to_var_id);
-    let rdex1 = net_tree_to_hvmc_tree(inet, root1, &mut port_to_var_id);
-    rdex.push((rdex0, rdex1));
+  let mut redexes = vec![];
+  for [root0, root1] in net_redexes {
+    let root0 = net_tree_to_hvmc_tree(inet, root0, &mut port_to_var_id);
+    let root1 = net_tree_to_hvmc_tree(inet, root1, &mut port_to_var_id);
+    redexes.push((root0, root1));
   }
-  Ok(Net { root, rdex })
+  Ok(Net { root, redexes })
 }
 
 fn net_tree_to_hvmc_tree(inet: &INet, tree_root: NodeId, port_to_var_id: &mut HashMap<Port, VarId>) -> Tree {
diff --git a/tests/golden_tests.rs b/tests/golden_tests.rs
index 6b6b28beb..e4e54c347 100644
--- a/tests/golden_tests.rs
+++ b/tests/golden_tests.rs
@@ -143,14 +143,14 @@ fn run_file() {
       let book = do_parse_book(code, path)?;
       // 1 million nodes for the test runtime. Smaller doesn't seem to make it any faster
       let (res, info) =
-        run_book(book, 1 << 20, RunOpts::lazy(), WarningOpts::deny_all(), CompileOpts::heavy())?;
+        run_book(book, 1 << 24, RunOpts::lazy(), WarningOpts::deny_all(), CompileOpts::heavy())?;
       Ok(format!("{}{}", display_readback_errors(&info.readback_errors), res))
     }),
     (&|code, path| {
       let book = do_parse_book(code, path)?;
       // 1 million nodes for the test runtime. Smaller doesn't seem to make it any faster
       let (res, info) =
-        run_book(book, 1 << 20, RunOpts::default(), WarningOpts::deny_all(), CompileOpts::heavy())?;
+        run_book(book, 1 << 24, RunOpts::default(), WarningOpts::deny_all(), CompileOpts::heavy())?;
       Ok(format!("{}{}", display_readback_errors(&info.readback_errors), res))
     }),
   ])
@@ -166,7 +166,7 @@ fn run_lazy() {
     desugar_opts.lazy_mode();
 
     // 1 million nodes for the test runtime. Smaller doesn't seem to make it any faster
-    let (res, info) = run_book(book, 1 << 20, run_opts, WarningOpts::deny_all(), desugar_opts)?;
+    let (res, info) = run_book(book, 1 << 24, run_opts, WarningOpts::deny_all(), desugar_opts)?;
     Ok(format!("{}{}", display_readback_errors(&info.readback_errors), res))
   })
 }
@@ -299,7 +299,7 @@ fn run_entrypoint() {
     book.entrypoint = Some(Name::from("foo"));
     // 1 million nodes for the test runtime. Smaller doesn't seem to make it any faster
     let (res, info) =
-      run_book(book, 1 << 20, RunOpts::default(), WarningOpts::deny_all(), CompileOpts::heavy())?;
+      run_book(book, 1 << 24, RunOpts::default(), WarningOpts::deny_all(), CompileOpts::heavy())?;
     Ok(format!("{}{}", display_readback_errors(&info.readback_errors), res))
   })
 }