diff --git a/index.js b/index.js
index a57ad78..532510e 100644
--- a/index.js
+++ b/index.js
@@ -1,115 +1,172 @@
-var resolve = require('resolve')
-var path = require('path')
-var assign = require('object-assign')
-var fs = require('fs')
+const resolve = require('resolve');
+const path = require('path');
+const fs = require('fs');
+
+const notNodeModuleRe = /^(\.|\/)/
+const clientRe = /\/client(\/|$)/
+const serverRe = /\/server(\/|$)/
+const packageNameRe = /name:[\s]*["']([a-z0-9A-Z\:\-_]+)["']/;
+exports.interfaceVersion = 2
 
-var notNodeModuleRe = /^(\.|\/)/
-var clientRe = /\/client(\/|$)/
-var serverRe = /\/server(\/|$)/
 
-exports.interfaceVersion = 2
+let packageCacheTimeout = 5 * 60 * 1000;
+let cacheUpdatedAt = new Date(0);
+let packageCache = [];
+let cachedMeteorRoot;
+let localPackageCache = [];
 
 exports.resolve = function (source, file, config) {
+
   const meteorDir = config && config.meteorDir;
-  if (resolve.isCore(source)) return { found: true, path: null }
+  if (resolve.isCore(source)) {
+    return { found: true, path: null }
+  }
 
   if (source.startsWith('meteor/')) {
-    var meteorRoot = findMeteorRoot(file, meteorDir)
-    return resolveMeteorPackage(source, meteorRoot)
+    if (!cachedMeteorRoot) {
+      cachedMeteorRoot = findMeteorRoot(file, meteorDir);
+    }
+    return resolveMeteorPackage(source, cachedMeteorRoot);
   }
 
-  var meteorSource = source
+  let meteorSource = source;
   if (source.startsWith('/')) {
-    var meteorRoot = findMeteorRoot(file, meteorDir)
-    meteorSource = path.resolve(meteorRoot, source.substr(1))
+    const meteorRoot = findMeteorRoot(file, meteorDir);
+    meteorSource = path.resolve(meteorRoot, source.substr(1));
   }
 
-  var fileUsingSlash = file.split(path.sep).join('/')
+  const fileUsingSlash = file.split(path.sep).join('/')
   if (!isNodeModuleImport(source) && (isClientInServer(source, fileUsingSlash) || isServerInClient(source, fileUsingSlash))) {
-    return { found: false }
+    return { found: false };
   }
 
   try {
-    return { found: true, path: resolve.sync(meteorSource, opts(file, config)) }
+    return { found: true, path: resolve.sync(meteorSource, opts(file, config)) };
   } catch (err) {
-    return { found: false }
+    return { found: false };
   }
 }
 
 function opts(file, config) {
-  return assign({},
+  return Object.assign({},
     config,
     {
       // path.resolve will handle paths relative to CWD
       basedir: path.dirname(path.resolve(file)),
       packageFilter: packageFilter,
-    })
+    });
 }
 
 function packageFilter(pkg, path, relativePath) {
   if (pkg['jsnext:main']) {
-    pkg['main'] = pkg['jsnext:main']
+    pkg['main'] = pkg['jsnext:main'];
   }
-  return pkg
+  return pkg;
 }
 
-function findMeteorRoot(start, meteorDir) {
-  start = start || module.parent.filename
+function findMeteorRoot(start, meteorDir = '') {
   meteorDir = meteorDir || '';
+
+  start = start || module.parent.filename;
+
   if (typeof start === 'string') {
-    if (start[start.length-1] !== path.sep) {
-      start += path.sep
+    if (start[start.length - 1] !== path.sep) {
+      start += path.sep;
     }
-    start = start.split(path.sep)
+    start = start.split(path.sep);
   }
-  if(!start.length) {
-    throw new Error('.meteor not found in path')
+
+  if (!start.length) {
+    throw new Error('.meteor not found in path');
   }
-  start.pop()
-  var dir = start.join(path.sep)
+  start.pop();
+  const dir = start.join(path.sep);
 
   try {
-    fs.statSync(path.join(dir, meteorDir, '.meteor'))
-    return path.join(dir, meteorDir)
-  } catch (e) {}
-  return findMeteorRoot(start, meteorDir)
+    fs.statSync(path.join(dir, meteorDir, '.meteor'));
+    return path.join(dir, meteorDir);
+  } catch (e) { }
+  return findMeteorRoot(start, meteorDir);
 }
 
 function isNodeModuleImport(source) {
-  return !notNodeModuleRe.test(source)
+  return !notNodeModuleRe.test(source);
 }
 
 function isClientInServer(source, file) {
-  return serverRe.test(source) && clientRe.test(file)
+  return serverRe.test(source) && clientRe.test(file);
 }
 
 function isServerInClient(source, file) {
-  return clientRe.test(source) && serverRe.test(file)
+  return clientRe.test(source) && serverRe.test(file);
 }
 
-function resolveMeteorPackage(source, meteorRoot) {
-  try {
-    var package = source.split('/')[1]
-    var packageCheckFile = package.indexOf(':') !== -1 ?
-      getPackageFile(meteorRoot) :
-      getVersionFile(meteorRoot)
-    var found = new RegExp('^' + package + '(?:@.*?)?(?:[ \s\t]*#.*)?$', 'm').test(packageCheckFile)
-    return found ?
-      { found: found, path: null } :
-      { found: false }
-  } catch (e) {
-    return { found: false }
-  }
+function isCacheOutdated() {
+  return Date.now() - cacheUpdatedAt.getTime() > packageCacheTimeout;
 }
 
 function getVersionFile(meteorRoot) {
-  var filePath = path.join(meteorRoot, '.meteor', 'versions')
-  var fileBuffer = fs.readFileSync(filePath)
-  return fileBuffer.toString()
+  const filePath = path.join(meteorRoot, '.meteor', 'versions');
+  const fileBuffer = fs.readFileSync(filePath);
+  return fileBuffer.toString();
 }
 
-function getPackageFile(meteorRoot) {
-  var filePath = path.join(meteorRoot, '.meteor', 'packages')
-  var fileBuffer = fs.readFileSync(filePath)
-  return fileBuffer.toString()
+function cachePackages(meteorRoot) {
+  packageCache = getVersionFile(meteorRoot)
+    .split('\n')
+    .filter(p => !!p.trim())
+    .map(p => p.split('@')[0]);
 }
+
+function cacheLocalPackages(meteorRoot) {
+
+  const packageDir = path.join(meteorRoot, 'packages');
+  localPackageCache = {};
+  fs.readdirSync(packageDir)
+    .filter(f => fs.existsSync(path.join(packageDir, f, 'package.js')))
+    .forEach((f) => {
+      const packageContent = fs.readFileSync(path.join(packageDir, f, 'package.js'), 'utf-8');
+      const extract = packageContent.match(packageNameRe);
+      if (Array.isArray(extract) && extract.length > 1) {
+        localPackageCache[extract[1]] = f;
+      } else {
+        localPackageCache[f] = f;
+      }
+    });
+}
+
+function updateCache(meteorRoot) {
+  cachePackages(meteorRoot);
+  cacheLocalPackages(meteorRoot);
+  cacheUpdatedAt = new Date();
+}
+
+function resolveMeteorPackage(source, meteorRoot) {
+  try {
+    const [_, packageName, ...file] = source.split('/');
+
+    if (isCacheOutdated()) {
+      updateCache(meteorRoot);
+    }
+
+    if (packageCache.includes(packageName)) {
+      if (Object.keys(localPackageCache).includes(packageName)) {
+        const baseName = path.join(meteorRoot, 'packages', localPackageCache[packageName], ...file);
+        const names = [
+          baseName,
+          baseName + '.js',
+          path.join(baseName, 'index.js'),
+        ];
+        const realPath = names.find(n => fs.existsSync(n));
+        if (realPath) {
+          return { found: true, path: realPath };
+        }
+        return { found: false };
+      }
+      return { found: true, path: null };
+    }
+    return { found: false };
+  } catch (e) {
+    return { found: false };
+  }
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 8ce0742..ef480ff 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,6 @@
   },
   "homepage": "https://github.com/clayne11/eslint-import-resolver-meteor",
   "dependencies": {
-    "object-assign": "^4.0.1",
     "resolve": "^1.1.6"
   },
   "peerDependencies": {