I have exact same problem.
Firestorm 4.3.1 (31155) Dec 2 2012 00:45:37 (Firestorm-Release) with Havok support
Release Notes
You are at 157,864.0, 287,613.0, 22.6 in Eternity Isle located at sim10141.agni.lindenlab.com (216.82.48.207:13018)
Second Life Server 13.03.15.271999
Release Notes
CPU: Intel® Core i7-3770 CPU @ 3.40GHz (3392.27 MHz)
Memory: 16331 MB
OS Version: Microsoft Windows 8 64-bit (Build 9200)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GT 630/PCIe/SSE2
Windows Graphics Driver Version: 9.18.0013.1106
OpenGL Version: 4.2.0
RestrainedLove API: RLV v2.7.0 / RLVa v1.4.7a
libcurl Version: libcurl/7.21.1 OpenSSL/1.0.0d zlib/1.2.5 c-ares/1.7.1
J2C Decoder Version: KDU
Audio Driver Version: FMOD version 3.750000
Qt Webkit Version: 4.7.1 (version number hard-coded)
Voice Server Version: Vivox 2.1.3010.6270
Settings mode: Phoenix
Viewer Skin: vintage (classic)
Font Used: Deja Vu (96)
Draw distance: 300
Bandwidth: 1000
LOD factor: 4
Built with MSVC version 1600
Packets Lost: 11/14,537 (0.1%)