diff --git a/etc/sample.conf b/etc/sample.conf
index ab89b364..98537436 100644
--- a/etc/sample.conf
+++ b/etc/sample.conf
@@ -11,6 +11,7 @@ use-workers: true
 prefix: ~/.bcoin
 db: leveldb
 max-files: 64
+cache-size: 100
 # fast: false
 
 # Logger
@@ -22,7 +23,7 @@ log-file: true
 # witness: true
 # prune: false
 use-checkpoints: true
-coin-cache: 40000000
+coin-cache: 40
 index-tx: false
 index-address: false
 
diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index 75380728..9a7c35f9 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -1410,9 +1410,9 @@ Chain.prototype.finish = function finish(block, entry) {
     block.txs.length,
     time);
 
-  if (this.db.coinCache.size > 0) {
-    this.logger.debug('Coin Cache: size=%dmb, total=%d.',
-      util.mb(this.db.coinCache.size), this.db.coinCache.total);
+  if (this.db.coinCache.capacity > 0) {
+    this.logger.debug('Coin Cache: size=%dmb, items=%d.',
+      util.mb(this.db.coinCache.size), this.db.coinCache.items);
   }
 };
 
diff --git a/lib/blockchain/chaindb.js b/lib/blockchain/chaindb.js
index 4ef37175..3887cac0 100644
--- a/lib/blockchain/chaindb.js
+++ b/lib/blockchain/chaindb.js
@@ -63,10 +63,9 @@ function ChainDB(chain) {
   this.db = LDB({
     location: chain.options.location,
     db: chain.options.db,
-    maxOpenFiles: chain.options.maxFiles,
+    maxFiles: chain.options.maxFiles,
+    cacheSize: chain.options.cacheSize || (32 << 20),
     compression: false,
-    cacheSize: 16 << 20,
-    writeBufferSize: 8 << 20,
     bufferKeys: !util.isBrowser
   });
 
@@ -800,7 +799,7 @@ ChainDB.prototype.getCoin = co(function* getCoin(hash, index) {
   if (this.options.spv)
     return;
 
-  if (this.coinCache.size !== 0) {
+  if (this.coinCache.capacity !== 0) {
     coins = yield this.getCoins(hash);
 
     if (!coins)
diff --git a/lib/db/ldb.js b/lib/db/ldb.js
index 032e1d61..17b61659 100644
--- a/lib/db/ldb.js
+++ b/lib/db/ldb.js
@@ -29,20 +29,24 @@ var backends = require('./backends');
 
 function LDB(options) {
   var target = LDB.getTarget(options);
+  var cacheSize = options.cacheSize;
 
   if (target.backend !== 'rbt')
     util.mkdir(target.location, true);
 
+  if (!cacheSize)
+    cacheSize = 16 << 20;
+
   return new LowlevelUp(target.location, {
     // Generic
     createIfMissing: options.createIfMissing !== false,
     errorIfExists: options.errorIfExists === true,
 
     // LevelDB
-    compression: options.compression !== false,
-    cacheSize: options.cacheSize || (8 << 20),
-    writeBufferSize: options.writeBufferSize || (4 << 20),
-    maxOpenFiles: options.maxOpenFiles || 64,
+    compression: options.compression === true,
+    cacheSize: cacheSize / 2 | 0,
+    writeBufferSize: cacheSize / 4 | 0,
+    maxOpenFiles: options.maxFiles || 64,
     paranoidChecks: false,
     memory: false,
 
diff --git a/lib/node/config.js b/lib/node/config.js
index 7ea737ee..487799ac 100644
--- a/lib/node/config.js
+++ b/lib/node/config.js
@@ -148,6 +148,7 @@ config.parseData = function parseData(data, prefix, dirname) {
   options.prefix = path(data.prefix, null, dirname);
   options.db = str(data.db);
   options.maxFiles = num(data.maxfiles);
+  options.cacheSize = mul(data.cachesize, 1024 * 1024);
   options.fast = bool(data.fast);
 
   // Update the prefix if we're using one.
@@ -164,7 +165,7 @@ config.parseData = function parseData(data, prefix, dirname) {
   options.forceWitness = bool(data.forcewitness);
   options.prune = bool(data.prune);
   options.useCheckpoints = bool(data.usecheckpoints);
-  options.coinCache = num(data.coincache);
+  options.coinCache = mul(data.coincache, 1024 * 1024);
   options.indexTX = bool(data.indextx);
   options.indexAddress = bool(data.indexaddress);
 
@@ -643,6 +644,13 @@ function num(value) {
   return value;
 }
 
+function mul(value, mult) {
+  value = num(value);
+  if (value == null)
+    return value;
+  return value * mult;
+}
+
 function boolpath(value, prefix, dirname) {
   if (!value)
     return null;
diff --git a/lib/node/fullnode.js b/lib/node/fullnode.js
index 768e8364..1d2eade9 100644
--- a/lib/node/fullnode.js
+++ b/lib/node/fullnode.js
@@ -74,7 +74,8 @@ function FullNode(options) {
     coinCache: this.options.coinCache,
     indexTX: this.options.indexTX,
     indexAddress: this.options.indexAddress,
-    maxFiles: this.options.maxFiles
+    maxFiles: this.options.maxFiles,
+    cacheSize: this.options.cacheSize
   });
 
   // Fee estimation.
@@ -141,7 +142,8 @@ function FullNode(options) {
     location: this.location('walletdb'),
     witness: false,
     useCheckpoints: this.options.useCheckpoints,
-    maxFiles: this.options.maxFiles,
+    maxFiles: this.options.walletMaxFiles,
+    cacheSize: this.options.walletCacheSize,
     startHeight: this.options.startHeight,
     wipeNoReally: this.options.wipeNoReally,
     resolution: false,
diff --git a/lib/node/node.js b/lib/node/node.js
index 292b3b59..91dd34fc 100644
--- a/lib/node/node.js
+++ b/lib/node/node.js
@@ -216,7 +216,8 @@ Node.prototype.parseOptions = function parseOptions(options) {
   if (options.fast) {
     options.headers = true;
     options.useCheckpoints = true;
-    options.coinCache = 65000000;
+    options.cacheSize = 300 << 20;
+    options.coinCache = 100 << 20;
   }
 
   if (options.witness == null)
diff --git a/lib/node/spvnode.js b/lib/node/spvnode.js
index 22cdf61a..69d03e72 100644
--- a/lib/node/spvnode.js
+++ b/lib/node/spvnode.js
@@ -54,6 +54,7 @@ function SPVNode(options) {
     forceWitness: this.options.forceWitness,
     useCheckpoints: this.options.useCheckpoints,
     maxFiles: this.options.maxFiles,
+    cacheSize: this.options.cacheSize,
     spv: true
   });
 
@@ -83,7 +84,8 @@ function SPVNode(options) {
     db: this.options.db,
     location: this.location('walletdb'),
     witness: false,
-    maxFiles: this.options.maxFiles,
+    maxFiles: this.options.walletMaxFiles,
+    cacheSize: this.options.walletCacheSize,
     startHeight: this.options.startHeight,
     wipeNoReally: this.options.wipeNoReally,
     resolution: true,
diff --git a/lib/primitives/block.js b/lib/primitives/block.js
index 4404aba5..ef8922a6 100644
--- a/lib/primitives/block.js
+++ b/lib/primitives/block.js
@@ -313,7 +313,7 @@ Block.prototype.createMerkleRoot = function createMerkleRoot(enc) {
  */
 
 Block.prototype.createWitnessNonce = function createWitnessNonce() {
-  return crypto.hash256(new Buffer(this.prevBlock, 'hex'));
+  return util.copy(constants.ZERO_HASH);
 };
 
 /**
diff --git a/lib/utils/lru.js b/lib/utils/lru.js
index e553f987..ea8f647d 100644
--- a/lib/utils/lru.js
+++ b/lib/utils/lru.js
@@ -13,22 +13,23 @@ var assert = require('assert');
  * An LRU cache, used for caching {@link ChainEntry}s.
  * @exports LRU
  * @constructor
- * @param {Number} maxSize
+ * @param {Number} capacity
  * @param {Function?} getSize
  */
 
-function LRU(maxSize, getSize) {
+function LRU(capacity, getSize) {
   if (!(this instanceof LRU))
-    return new LRU(maxSize, getSize);
-
-  this.maxSize = maxSize;
-  this.getSize = getSize;
+    return new LRU(capacity, getSize);
 
+  assert(typeof capacity === 'number', 'Max size must be a number.');
   assert(!getSize || typeof getSize === 'function', 'Bad size callback.');
 
+  this.capacity = capacity;
+  this.getSize = getSize;
+
   this.map = {};
   this.size = 0;
-  this.total = 0;
+  this.items = 0;
   this.head = null;
   this.tail = null;
   this.pending = null;
@@ -60,14 +61,14 @@ LRU.prototype._getSize = function _getSize(item) {
 LRU.prototype._compact = function _compact() {
   var item, next;
 
-  if (this.size <= this.maxSize)
+  if (this.size <= this.capacity)
     return;
 
   for (item = this.head; item; item = next) {
-    if (this.size <= this.maxSize)
+    if (this.size <= this.capacity)
       break;
     this.size -= this._getSize(item);
-    this.total--;
+    this.items--;
     delete this.map[item.key];
     next = item.next;
     item.prev = null;
@@ -93,7 +94,7 @@ LRU.prototype.reset = function reset() {
 
   for (item = this.head; item; item = next) {
     delete this.map[item.key];
-    this.total--;
+    this.items--;
     next = item.next;
     item.prev = null;
     item.next = null;
@@ -136,7 +137,7 @@ LRU.prototype.set = function set(key, value) {
   this._appendList(item);
 
   this.size += this._getSize(item);
-  this.total++;
+  this.items++;
 
   this._compact();
 };
@@ -190,7 +191,7 @@ LRU.prototype.remove = function remove(key) {
     return false;
 
   this.size -= this._getSize(item);
-  this.total--;
+  this.items--;
 
   delete this.map[key];
 
@@ -469,8 +470,9 @@ function LRUOp(remove, key, value) {
  */
 
 function NullCache(size) {
+  this.capacity = 0;
   this.size = 0;
-  this.total = 0;
+  this.items = 0;
 }
 
 NullCache.prototype.set = function set(key, value) {};
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index 7de6909a..012f008b 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -95,9 +95,9 @@ function WalletDB(options) {
   this.db = LDB({
     location: this.options.location,
     db: this.options.db,
-    maxOpenFiles: this.options.maxFiles,
-    cacheSize: 8 << 20,
-    writeBufferSize: 4 << 20,
+    maxFiles: this.options.maxFiles,
+    cacheSize: this.options.cacheSize,
+    compression: true,
     bufferKeys: !util.isBrowser
   });
 }
diff --git a/migrate/chaindb0to1.js b/migrate/chaindb0to1.js
index af612c47..250aa190 100644
--- a/migrate/chaindb0to1.js
+++ b/migrate/chaindb0to1.js
@@ -12,8 +12,7 @@ var db = bcoin.ldb({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/chaindb1to2.js b/migrate/chaindb1to2.js
index db218763..152b7a8c 100644
--- a/migrate/chaindb1to2.js
+++ b/migrate/chaindb1to2.js
@@ -23,8 +23,7 @@ db = LDB({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/ensure-tip-index.js b/migrate/ensure-tip-index.js
index dfa78f5a..a2af3590 100644
--- a/migrate/ensure-tip-index.js
+++ b/migrate/ensure-tip-index.js
@@ -19,8 +19,7 @@ db = LDB({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/walletdb2to3.js b/migrate/walletdb2to3.js
index 0c890523..295213e4 100644
--- a/migrate/walletdb2to3.js
+++ b/migrate/walletdb2to3.js
@@ -21,8 +21,7 @@ db = bcoin.ldb({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/walletdb3to4.js b/migrate/walletdb3to4.js
index 0a5002c9..b5e90727 100644
--- a/migrate/walletdb3to4.js
+++ b/migrate/walletdb3to4.js
@@ -22,8 +22,7 @@ db = bcoin.ldb({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/walletdb4to5.js b/migrate/walletdb4to5.js
index 0468b9a5..032c3ad1 100644
--- a/migrate/walletdb4to5.js
+++ b/migrate/walletdb4to5.js
@@ -16,8 +16,7 @@ db = bcoin.ldb({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });
diff --git a/migrate/walletdb5to6.js b/migrate/walletdb5to6.js
index bc5ad879..7883d3d5 100644
--- a/migrate/walletdb5to6.js
+++ b/migrate/walletdb5to6.js
@@ -16,8 +16,7 @@ db = bcoin.ldb({
   location: file,
   db: 'leveldb',
   compression: true,
-  cacheSize: 16 << 20,
-  writeBufferSize: 8 << 20,
+  cacheSize: 32 << 20,
   createIfMissing: false,
   bufferKeys: true
 });