Random: Reduce number of PRNG buffers

router/java/src/net/i2p/router/RouterContext.java

@@ -120,7 +120,8 @@ public class RouterContext extends I2PAppContext {
             // or about 2 seconds per buffer - so about 200x faster
             // to fill than to drain - so we don't need too many
             long maxMemory = SystemVersion.getMaxMemory();
-            long buffs = Math.min(16, Math.max(2, maxMemory / (14 * 1024 * 1024)));
+            long maxBuffs = (SystemVersion.isAndroid() || SystemVersion.isARM()) ? 4 : 8;
+            long buffs = Math.min(maxBuffs, Math.max(2, maxMemory / (21 * 1024 * 1024)));
             envProps.setProperty("prng.buffers", "" + buffs);
         }
         return envProps;