diff --git a/src/game/rooms.js b/src/game/rooms.js
index f2bac2e1..e745bc23 100644
--- a/src/game/rooms.js
+++ b/src/game/rooms.js
@@ -364,11 +364,11 @@ function _findClosestByPath2(fromPos, objects, opts) {
         lastPos = ret.path[ret.path.length-1];
     }
 
-    objects.forEach(obj => {
+    for (const obj of objects) {
         if(lastPos.isNearTo(obj)) {
             result = obj;
         }
-    });
+    }
 
     return result;
 }
@@ -649,7 +649,7 @@ exports.make = function(_runtimeData, _intents, _register, _globals) {
             result = _.filter(result, opts.filter);
         }
         else {
-            result = _.clone(result);
+            result = [...result];
         }
 
         return result;
@@ -874,7 +874,7 @@ exports.make = function(_runtimeData, _intents, _register, _globals) {
             path,
             cacheKeySuffix = '';
 
-        opts = _.clone(opts || {});
+        opts = opts ? {...opts} : {};
 
         if(opts.ignoreCreeps) {
             cacheKeySuffix += '_ignoreCreeps'
@@ -1399,7 +1399,7 @@ exports.makePos = function(_register) {
             room = register.rooms[this.roomName];
 
         if(_.isObject(secondArg)) {
-            opts = _.clone(secondArg);
+            opts = {...secondArg};
         }
         opts = opts || {};
 
@@ -1428,7 +1428,7 @@ exports.makePos = function(_register) {
 
     RoomPosition.prototype.findClosestByPath = register.wrapFn(function(type, opts) {
 
-        opts = _.clone(opts || {});
+        opts = opts ? {...opts} : {};
 
         var room = register.rooms[this.roomName];
 
@@ -1522,7 +1522,7 @@ exports.makePos = function(_register) {
             throw new Error(`Could not access room ${this.roomName}`);
         }
 
-        opts = _.clone(opts || {});
+        opts = opts ? {...opts} : {};
 
         var objects = [],
             result = [];
@@ -1534,11 +1534,11 @@ exports.makePos = function(_register) {
             objects = opts.filter ? _.filter(type, opts.filter) : type;
         }
 
-        objects.forEach((i) => {
+        for (const i of objects) {
             if(this.inRangeTo(i, range)) {
                 result.push(i);
             }
-        });
+        }
 
         return result;
     });
@@ -1550,7 +1550,7 @@ exports.makePos = function(_register) {
             throw new Error(`Could not access room ${this.roomName}`);
         }
 
-        opts = _.clone(opts || {});
+        opts = opts ? {...opts} : {};
 
         var objects = [],
         result = [];
diff --git a/src/processor/global-intents/market.js b/src/processor/global-intents/market.js
index e8ec14b3..e892181e 100644
--- a/src/processor/global-intents/market.js
+++ b/src/processor/global-intents/market.js
@@ -68,9 +68,11 @@ module.exports = function({orders, userIntents, usersById, gameTime, roomObjects
         return true;
     }
 
-    _.filter(terminals, i => !!i.send).forEach(terminal => {
-
-        var intent = terminal.send;
+    terminals.forEach(terminal => {
+        const intent = terminal.send;
+        if (!intent) {
+            return;
+        }
 
         bulkObjects.update(terminal, {send: null});
 
diff --git a/src/processor/intents/creeps/attackController.js b/src/processor/intents/creeps/attackController.js
index 5fe01e89..505eb6ac 100644
--- a/src/processor/intents/creeps/attackController.js
+++ b/src/processor/intents/creeps/attackController.js
@@ -50,4 +50,4 @@ module.exports = function(object, intent, {roomObjects, bulk, roomController, ga
     object.actionLog.attack = {x: target.x, y: target.y};
 
     eventLog.push({event: C.EVENT_ATTACK_CONTROLLER, objectId: object._id})
-};
\ No newline at end of file
+};
diff --git a/src/processor/intents/creeps/claimController.js b/src/processor/intents/creeps/claimController.js
index 59120a70..150798b3 100644
--- a/src/processor/intents/creeps/claimController.js
+++ b/src/processor/intents/creeps/claimController.js
@@ -25,7 +25,7 @@ module.exports = function(object, intent, {roomObjects, bulk, bulkUsers, users})
     if(target.level > 0) {
         return;
     }
-    if ((_.filter(object.body, (i) => i.hits > 0 && i.type == C.CLAIM).length) === 0) {
+    if (!object.body.some((i) => i.hits > 0 && i.type == C.CLAIM)) {
         return;
     }
     if(target.reservation && target.reservation.user != object.user) {
@@ -49,4 +49,4 @@ module.exports = function(object, intent, {roomObjects, bulk, bulkUsers, users})
     });
 
     driver.addRoomToUser(object.room, users[object.user], bulkUsers);
-};
\ No newline at end of file
+};
diff --git a/src/processor/intents/creeps/invaders/findAttack.js b/src/processor/intents/creeps/invaders/findAttack.js
index 6f27665e..4705998d 100644
--- a/src/processor/intents/creeps/invaders/findAttack.js
+++ b/src/processor/intents/creeps/invaders/findAttack.js
@@ -80,15 +80,15 @@ module.exports = function(creep, context) {
     }
 
     if(!target) {
-        const unreachableSpawns = _.filter(roomObjects, o =>
+        const unreachableSpawn = roomObjects ? roomObjects.find(o =>
             o.type == 'spawn' && !checkPath(creep, new fakeRuntime.RoomPosition(o.x, o.y, o.room), scope)
-        );
-        if(!unreachableSpawns.length && roomController && roomController.user) {
+        ) : null;
+        if(!unreachableSpawn && roomController && roomController.user) {
             intents.set(creep._id, 'suicide', {});
             return;
         }
 
-        target = unreachableSpawns[0];
+        target = unreachableSpawn;
         if(target) {
             const direction = fakeRuntime.moveTo(creep, target, {ignoreDestructibleStructures: true, maxRooms: 1, ignoreRoads: true}, scope);
             if(direction) {
@@ -105,15 +105,15 @@ module.exports = function(creep, context) {
         }
 
         const pos = fakeRuntime.RoomPosition.sUnpackLocal(creep['memory_move']['path'][0], creep.room);
-        const structures = _.filter(roomObjects, o => !!C.CONTROLLER_STRUCTURES[o.type] && o.type != 'spawn' && o.x == pos.x && o.y == pos.y);
-        if(structures.length > 0) {
+        const structure = roomObjects.find(o => !!C.CONTROLLER_STRUCTURES[o.type] && o.type != 'spawn' && o.x == pos.x && o.y == pos.y);
+        if(structure) {
             if(fakeRuntime.hasActiveBodyparts(creep, C.RANGED_ATTACK)) {
-                intents.set(creep._id, 'rangedAttack', { id: structures[0]._id })
+                intents.set(creep._id, 'rangedAttack', { id: structure._id })
             }
             if(fakeRuntime.hasActiveBodyparts(creep, C.WORK)) {
-                intents.set(creep._id, 'dismantle', { id: structures[0]._id });
+                intents.set(creep._id, 'dismantle', { id: structure._id });
             } else {
-                intents.set(creep._id, 'attack', { id: structures[0]._id, x: structures[0].x, y: structures[0].y });
+                intents.set(creep._id, 'attack', { id: structure._id, x: structure.x, y: structure.y });
             }
         }
     }
diff --git a/src/processor/intents/creeps/invaders/flee.js b/src/processor/intents/creeps/invaders/flee.js
index 6046fcab..67adf141 100644
--- a/src/processor/intents/creeps/invaders/flee.js
+++ b/src/processor/intents/creeps/invaders/flee.js
@@ -7,8 +7,8 @@ const _ = require('lodash'),
 module.exports = function(creep, range, context) {
     const {scope, intents, hostiles} = context;
 
-    const nearCreeps = _.filter(hostiles, c => utils.dist(creep, c) < range);
-    if(_.some(nearCreeps)) {
+    const nearCreeps = hostiles.filter(c => utils.dist(creep, c) < range);
+    if(nearCreeps.length > 0) {
         const direction = fakeRuntime.flee(creep, nearCreeps, range, {}, scope);
         if(direction) {
             intents.set(creep._id, 'move', { direction });
diff --git a/src/processor/intents/creeps/invaders/healer.js b/src/processor/intents/creeps/invaders/healer.js
index 525fe223..d69ad06f 100644
--- a/src/processor/intents/creeps/invaders/healer.js
+++ b/src/processor/intents/creeps/invaders/healer.js
@@ -8,9 +8,9 @@ const _ = require('lodash'),
 module.exports = function(creep, context) {
     const {scope, intents, invaders} = context;
 
-    let healTargets = _.filter(invaders, c => utils.dist(c, creep) <= 3);
-    if(_.some(healTargets)) {
-        const healTarget = _.first(healTargets.sort((a, b) => (b.hitsMax - b.hits) - (a.hitsMax - a.hits)));
+    let healTargets = invaders.filter(c => utils.dist(c, creep) <= 3);
+    if(healTargets.length > 0) {
+        const healTarget = healTargets.sort((a, b) => (b.hitsMax - b.hits) - (a.hitsMax - a.hits))[0];
         if(utils.dist(creep, healTarget) <= 1) {
             intents.set(creep._id, 'heal', {id: healTarget._id, x: healTarget.x, y: healTarget.y});
         } else {
diff --git a/src/processor/intents/invader-core/stronghold/creeps.js b/src/processor/intents/invader-core/stronghold/creeps.js
index b5ac9e58..5f00f6cc 100644
--- a/src/processor/intents/invader-core/stronghold/creeps.js
+++ b/src/processor/intents/invader-core/stronghold/creeps.js
@@ -86,7 +86,7 @@ const behaviors = {
         const safeMatrixCallback = defence.createSafeMatrixCallback(context);
 
         fakeRuntime.walkTo(creep, target, { range: 3, costCallback: safeMatrixCallback }, context);
-        const targetInRange = _.first(_.filter(repairRamparts, r => utils.dist(creep, r) <= 3));
+        const targetInRange = repairRamparts.find(r => utils.dist(creep, r) <= 3);
         if(targetInRange) {
             intents.set(creep._id, 'repair', {id: targetInRange._id, x: targetInRange.x, y: targetInRange.y});
         }
diff --git a/src/processor/intents/invader-core/stronghold/stronghold.js b/src/processor/intents/invader-core/stronghold/stronghold.js
index 726b4b43..fe3eddc3 100644
--- a/src/processor/intents/invader-core/stronghold/stronghold.js
+++ b/src/processor/intents/invader-core/stronghold/stronghold.js
@@ -154,8 +154,8 @@ const refillTowers = function refillTowers(context) {
         return false;
     }
 
-    const underchargedTowers = _.filter(towers, t => (t.store.energy <= 2*C.TOWER_ENERGY_COST) && _.some(ramparts, {x: t.x, y: t.y}));
-    if(_.some(underchargedTowers)) {
+    const underchargedTowers = towers.filter(t => (t.store.energy <= 2*C.TOWER_ENERGY_COST) && _.some(ramparts, {x: t.x, y: t.y}));
+    if(underchargedTowers.length > 0) {
         const towerToCharge = _.min(underchargedTowers, 'store.energy');
         if(towerToCharge) {
             intents.set(core._id, 'transfer', {id: towerToCharge._id, amount: towerToCharge.storeCapacityResource.energy - towerToCharge.store.energy, resourceType: C.RESOURCE_ENERGY});
@@ -169,8 +169,8 @@ const refillTowers = function refillTowers(context) {
 const refillCreeps = function refillCreeps(context) {
     const {core, intents, defenders} = context;
 
-    const underchargedCreeps = _.filter(defenders, c => (c.storeCapacity > 0) && (2*c.store.energy <= c.storeCapacity));
-    if(_.some(underchargedCreeps)) {
+    const underchargedCreeps = defenders.filter(c => (c.storeCapacity > 0) && (2*c.store.energy <= c.storeCapacity));
+    if(underchargedCreeps.length > 0) {
         const creep = _.min(underchargedCreeps, 'store.energy');
         if(creep) {
             intents.set(core._id, 'transfer', {id: creep._id, amount: creep.storeCapacity - creep.store.energy, resourceType: C.RESOURCE_ENERGY});
@@ -187,8 +187,8 @@ const towersMaintenance = function towersMaintenance(context) {
         return;
     }
 
-    const protectedCreeps = _.filter(damagedDefenders, d => _.some(ramparts, {x: d.x, y: d.y}));
-    if(_.some(protectedCreeps)) {
+    const protectedCreeps = damagedDefenders.filter(d => _.some(ramparts, {x: d.x, y: d.y}));
+    if(protectedCreeps.length > 0) {
         const creep = _.first(protectedCreeps);
         const tower = _.first(towers);
         intents.set(tower._id, 'heal', {id: creep._id});
@@ -196,8 +196,8 @@ const towersMaintenance = function towersMaintenance(context) {
         return;
     }
 
-    const protectedRoads = _.filter(damagedRoads, r => _.some(ramparts, {x: r.x, y: r.y}));
-    if(_.some(protectedRoads)) {
+    const protectedRoads = damagedRoads.filter(r => _.some(ramparts, {x: r.x, y: r.y}));
+    if(protectedRoads.length > 0) {
         const road = _.first(damagedRoads);
         const tower = _.first(towers);
         intents.set(tower._id, 'repair', {id: road._id});
@@ -220,12 +220,12 @@ const focusClosest = function focusClosest(context) {
         intents.set(t._id, 'attack', {id: target._id});
     }
 
-    const meleesNear = _.filter(defenders, d => (range(d, target) == 1) && _.some(d.body, {type: C.ATTACK}));
+    const meleesNear = defenders.filter(d => (range(d, target) == 1) && _.some(d.body, {type: C.ATTACK}));
     for(let melee of meleesNear) {
         intents.set(melee._id, 'attack', {id: target._id, x: target.x, y: target.y});
     }
 
-    const rangersInRange = _.filter(defenders, d => (range(d, target) <= 3) && _.some(d.body, {type: C.RANGED_ATTACK}));
+    const rangersInRange = defenders.filter(d => (range(d, target) <= 3) && _.some(d.body, {type: C.RANGED_ATTACK}));
     for(let r of rangersInRange) {
         if(range(r,target) == 1) {
             intents.set(r._id, 'rangedMassAttack', {});
@@ -244,7 +244,7 @@ const focusMax = function focusMax(context) {
         return false;
     }
 
-    const activeTowers = _.filter(towers, t => t.store.energy >= C.TOWER_ENERGY_COST);
+    const activeTowers = towers.filter(t => t.store.energy >= C.TOWER_ENERGY_COST);
     const target = _.max(hostiles, creep => {
         let damage = _.sum(activeTowers, tower => {
             let r = utils.dist(creep, tower);
@@ -277,12 +277,12 @@ const focusMax = function focusMax(context) {
         return damage;
     });
 
-    const meleesNear = _.filter(defenders, d => (range(d, target) == 1) && _.some(d.body, {type: C.ATTACK}));
+    const meleesNear = defenders.filter(d => (range(d, target) == 1) && _.some(d.body, {type: C.ATTACK}));
     for(let melee of meleesNear) {
         intents.set(melee._id, 'attack', {id: target._id, x: target.x, y: target.y});
     }
 
-    const rangersInRange = _.filter(defenders, d => (range(d, target) <= 3) && _.some(d.body, {type: C.RANGED_ATTACK}));
+    const rangersInRange = defenders.filter(d => (range(d, target) <= 3) && _.some(d.body, {type: C.RANGED_ATTACK}));
     for(let r of rangersInRange) {
         if(range(r,target) == 1) {
             intents.set(r._id, 'rangedMassAttack', {});
diff --git a/src/processor/intents/spawns/renew-creep.js b/src/processor/intents/spawns/renew-creep.js
index 6818f76a..6e3a7bba 100644
--- a/src/processor/intents/spawns/renew-creep.js
+++ b/src/processor/intents/spawns/renew-creep.js
@@ -21,7 +21,7 @@ module.exports = function(object, intent, scope) {
     if(Math.abs(target.x - object.x) > 1 || Math.abs(target.y - object.y) > 1) {
         return;
     }
-    if(_.filter(target.body, (i) => i.type == C.CLAIM).length > 0) {
+    if(target.body.some((i) => i.type == C.CLAIM)) {
         return;
     }
 
diff --git a/src/utils.js b/src/utils.js
index 7c25b460..24a9a435 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,5 +1,31 @@
 var _ = require('lodash');
 
+// shim lodash to use native array methods, built into the VM, when available.
+// this only works if the module imports _ instead of the method directly.
+const oldFilter = _.filter;
+_.filter = (data, predicate) => {
+    if (data && typeof predicate === 'function') {
+        return data.filter(predicate);
+    }
+    return oldFilter(data, predicate);
+}
+
+const oldFind = _.find;
+_.find = (data, predicate) => {
+    if (data && typeof predicate === 'function') {
+        return data.find(predicate);
+    }
+    return oldFind(data, predicate);
+}
+
+const oldMap = _.map;
+_.map = (data, predicate) => {
+    if (data && typeof predicate === 'function') {
+        return data.map(predicate);
+    }
+    return oldMap(data, predicate);
+}
+
 var driver, C, offsetsByDirection = [, [0,-1], [1,-1], [1,0], [1,1], [0,1], [-1,1], [-1,0], [-1,-1]];
 
 function loadDriver() {