@@ -576,9 +576,9 @@ "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
       "dev": true
     },
     "fastfile": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/fastfile/-/fastfile-0.0.7.tgz",
-      "integrity": "sha512-Zk7sdqsV6DsN/rhjULDfCCowPiMDsziTMFicdkrKN80yybr/6YFf9H91ELXN85dVEf6EYkVR5EHkZNc0dMqZKA=="
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/fastfile/-/fastfile-0.0.8.tgz",
+      "integrity": "sha512-i78nuMJUoNZP5J1bPjecK07+ifHMJTBnJND/4QMUYp++DDltoAjQcIeFIWoUalt7n324fvvzWR55+WEPQUA7tQ=="
     },
     "ffiasm": {
       "version": "0.0.2",
@@ -1167,6 +1167,13 @@ "integrity": "sha512-7m4eWpnbjkwGGUaRmIAJc4w+HvaeBPJXUKHIqLkHeD9Yyjem6/EHmlgDVl+4hWNWGZqdhXuMqWSH9+O6QOXBdw==",
       "requires": {
         "fastfile": "0.0.7",
         "ffjavascript": "0.2.4"
+      },
+      "dependencies": {
+        "fastfile": {
+          "version": "0.0.7",
+          "resolved": "https://registry.npmjs.org/fastfile/-/fastfile-0.0.7.tgz",
+          "integrity": "sha512-Zk7sdqsV6DsN/rhjULDfCCowPiMDsziTMFicdkrKN80yybr/6YFf9H91ELXN85dVEf6EYkVR5EHkZNc0dMqZKA=="
+        }
       }
     },
     "regexpp": {

@@ -31,7 +31,7 @@ },
   "dependencies": {
     "chai": "^4.2.0",
     "circom_runtime": "0.0.6",
-    "fastfile": "0.0.7",
+    "fastfile": "0.0.8",
     "ffiasm": "0.0.2",
     "ffjavascript": "0.2.4",
     "ffwasm": "0.0.7",

@@ -44,9 +44,12 @@ ctx.verbose= options.verbose || false;
     ctx.mainComponent = options.mainComponent || "main";
     ctx.newThreadTemplates = options.newThreadTemplates;
 
+    if (ctx.verbose) console.time("Construction Phase");
     constructionPhase(ctx, srcFile);
+    if (ctx.verbose) console.timeEnd("Construction Phase");
 
     if (ctx.verbose) console.log("NConstraints Before: "+ctx.constraints.length);
+    if (ctx.verbose) console.log("NSignals Before: "+ctx.signals.length);
 
     if (ctx.error) {
         throw(ctx.error);
@@ -57,10 +60,15 @@ throw new Error("A main component must be defined");
     }
 
     if (ctx.verbose) console.log("Classify Signals");
+    if (ctx.verbose) console.time("Classify Signals");
     classifySignals(ctx);
+    if (ctx.verbose) console.timeEnd("Classify Signals");
 
     if (ctx.verbose) console.log("Reduce Constants");
+    if (ctx.verbose) console.time("Reduce Constants");
     reduceConstants(ctx);
+    if (ctx.verbose) console.timeEnd("Reduce Constants");
+
     if (options.reduceConstraints) {
 
         if (ctx.verbose) console.log("Reduce Constraints");
@@ -73,13 +81,17 @@ oldNConstrains = ctx.constraints.length;
             reduceConstrains(ctx);
         }
 */
-
+        if (ctx.verbose) console.time("Reduce Constraints");
         await reduceConstrains(ctx);
+        if (ctx.verbose) console.timeEnd("Reduce Constraints");
+
     }
 
     if (ctx.verbose) console.log("NConstraints After: "+ctx.constraints.length);
 
+    if (ctx.verbose) console.time("Generate Witness Names");
     generateWitnessNames(ctx);
+    if (ctx.verbose) console.timeEnd("Generate Witness Names");
 
     if (ctx.error) {
         throw(ctx.error);
@@ -87,16 +99,19 @@ }
 
     if (options.cSourceWriteStream) {
         if (ctx.verbose) console.log("Generating c...");
+        if (ctx.verbose) console.time("Generate C");
         ctx.builder = new BuilderC(options.prime);
         build(ctx);
         const rdStream = ctx.builder.build();
         rdStream.pipe(options.cSourceWriteStream);
+        if (ctx.verbose) console.timeEnd("Generate C");
 
         // await new Promise(fulfill => options.cSourceWriteStream.on("finish", fulfill));
     }
 
     if ((options.wasmWriteStream)||(options.watWriteStream)) {
         if (ctx.verbose) console.log("Generating wasm...");
+        if (ctx.verbose) console.time("Generating wasm");
         ctx.builder = new BuilderWasm(options.prime);
         build(ctx);
         if (options.wasmWriteStream) {
@@ -107,6 +122,7 @@ if (options.watWriteStream) {
             const rdStream = ctx.builder.build("wat");
             rdStream.pipe(options.watWriteStream);
         }
+        if (ctx.verbose) console.timeEnd("Generate wasm");
 
         // await new Promise(fulfill => options.wasmWriteStream.on("finish", fulfill));
     }
@@ -116,13 +132,17 @@ if (ctx.error) throw(ctx.error);
 
     if (options.r1csFileName) {
         if (ctx.verbose) console.log("Generating r1cs...");
+        if (ctx.verbose) console.time("Generating r1cs");
         await buildR1cs(ctx, options.r1csFileName);
+        if (ctx.verbose) console.timeEnd("Generating r1cs");
     }
 
     if (options.symWriteStream) {
         if (ctx.verbose) console.log("Generating syms...");
+        if (ctx.verbose) console.time("Generating syms");
         const rdStream = buildSyms(ctx);
         rdStream.pipe(options.symWriteStream);
+        if (ctx.verbose) console.timeEnd("Generating syms");
 
         // await new Promise(fulfill => options.symWriteStream.on("finish", fulfill));
     }
@@ -154,6 +174,7 @@ }
 
     // First classify the signals
     for (let s=0; s<ctx.signals.length; s++) {
+        if ((ctx.verbose)&&(s%100000 == 0)) console.log(`classify signals: ${s}/${ctx.signals.length}`);
         const signal = ctx.signals[s];
         let tAll = ctx.stINTERNAL;
         let lSignal = signal;

@@ -123,6 +123,7 @@ };
     }
 
     _signal2lc(a) {
+        const self = this;
         if (a.t == "S") {
             const lc = {
                 t: "LC",

@@ -4,10 +4,13 @@ const assert = require("assert");
 
 module.exports.buildR1cs = buildR1cs;
 
+
 async function buildR1cs(ctx, fileName) {
 
     const fd = await fastFile.createOverride(fileName);
 
+
+    const buffBigInt = new Uint8Array(ctx.F.n8);
 
     const type = "r1cs";
     const buff = new Uint8Array(4);
@@ -112,12 +115,9 @@ }
 
     async function writeBigInt(n, pos) {
 
-        const s = n.toString(16);
-        const b = Buffer.from(s.padStart(n8*2, "0"), "hex");
-        const buff = new Uint8Array(b.length);
-        for (let i=0; i<b.length; i++) buff[i] = b[b.length-1-i];
+        ctx.F.toRprLE(buffBigInt, 0, n);
 
-        await fd.write(buff, pos);
+        await fd.write(buffBigInt, pos);
 
     }
 }