browser benchmark
Intel Core i7-3615QM testing with a Apple MacBookPro10 1 1.0 and NVIDIA GeForce GT 650M 981MB on FreeBSD via the Phoronix Test Suite.


Firefox 83: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: Intel NVIDIA NVE7 1GB (1200MHz), Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.10.1-gentoo-x86_64-gcc (x86_64), Desktop: Xfce 4.14, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: f2fs, Screen Resolution: 2880x1800

Firefox-bin 84: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: Intel NVIDIA NVE7 1GB (1200MHz), Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.9.14-gentoo-x86_64-gcc (x86_64), Desktop: Xfce, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: ext4, Screen Resolution: 2880x1800

Firefox-bin 84 try2: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: Intel NVIDIA NVE7 1GB (1200MHz), Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.9.14-gentoo-x86_64-gcc (x86_64), Desktop: Xfce, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: ext4, Screen Resolution: 2880x1800

Firefox 84 Default: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: Intel NVIDIA NVE7 1GB, Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.9.15-gentoo-x86_64-gcc (x86_64), Desktop: Xfce, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: ext4, Screen Resolution: 2880x1800

Firefox 84 Default2: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: NVIDIA NVE7 1GB (1200MHz), Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.10.1-gentoo-r1-x86_64-gcc (x86_64), Desktop: Xfce, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, OpenGL: 4.3 Mesa 20.3.1, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: ext4, Screen Resolution: 2880x1800

Firefox 84 lto: 

	Processor: Intel Core i7-3615QM @ 3.30GHz (4 Cores / 8 Threads), Motherboard: Apple Mac-C3EC7CD22292981F (262.0.0.0.0 BIOS), Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 251GB APPLE SSD SM256E, Graphics: NVIDIA NVE7 1GB, Audio: Cirrus Logic CS4206, Monitor: Color LCD, Network: Broadcom NetXtreme BCM57786 PCIe + Broadcom BCM4331 802.11a/b/g/n

	OS: Gentoo/Linux, Kernel: 5.10.2-gentoo-x86_64-gcc (x86_64), Desktop: Xfce 4.16, Display Server: X Server 1.20.10, Display Driver: nouveau 1.0.16, OpenGL: 4.3 Mesa 20.3.1, Compiler: GCC 10.2.0 + Clang 11.0.0Target: + LLVM 11.0.0, File-System: ext4, Screen Resolution: 2880x1800

Firefox-bin 84 macos 10.15.7: 

	Processor: Intel Core i7-3615QM @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.15.7, Kernel: 19.6.0 (x86_64), Compiler: Clang 12.0.0 + GCC 12.0.0 + Xcode 12.3, File-System: APFS, Screen Resolution: 2880x1800

Firefox 87 FreeBSD lto=thin: 

	Processor: Intel Core i7-3615QM @ 2.30GHz (8 Cores), Motherboard: Apple MacBookPro10 1 1.0, Chipset: Intel 3rd Gen Core DRAM, Memory: 8GB, Disk: 187GB, Graphics: NVIDIA GeForce GT 650M 981MB, Audio: NVIDIA (0x0e1b) HDA, Monitor: Color LCD

	OS: FreeBSD, Kernel: 13.0-RC3 (x86_64), Desktop: MATE 1.24.1, Display Server: X Server 1.20.9, Display Driver: NVIDIA, Compiler: Clang 11.0.1, File-System: zfs, Screen Resolution: 2880x1800


Selenium
Benchmark: ARES-6 - Browser: Firefox
ms < Lower Is Better
Firefox 83 ................... 243.98 |========================================
Firefox-bin 84 try2 .......... 80.36  |=============
Firefox 84 Default ........... 99.70  |================
Firefox 84 Default2 .......... 99.10  |================
Firefox 84 lto ............... 96.92  |================
Firefox-bin 84 macos 10.15.7 . 84.29  |==============
Firefox 87 FreeBSD lto=thin .. 86.14  |==============


Selenium
Benchmark: Octane - Browser: Firefox
Geometric Mean > Higher Is Better
Firefox 83 ................... 4379  |==============
Firefox-bin 84 try2 .......... 13298 |=========================================
Firefox 84 Default2 .......... 12399 |======================================
Firefox 84 lto ............... 12377 |======================================
Firefox-bin 84 macos 10.15.7 . 12596 |=======================================
Firefox 87 FreeBSD lto=thin .. 12346 |======================================


Selenium
Benchmark: Basemark - Browser: Firefox
Overall Score > Higher Is Better
Firefox 83 .................. 126.88 |=============
Firefox 87 FreeBSD lto=thin . 392.24 |=========================================


Selenium
Benchmark: Speedometer - Browser: Firefox
Runs Per Minute > Higher Is Better
Firefox 83 ................... 19.80 |============
Firefox 84 Default2 .......... 51.60 |=================================
Firefox 84 lto ............... 52.90 |=================================
Firefox-bin 84 macos 10.15.7 . 65.00 |=========================================
Firefox 87 FreeBSD lto=thin .. 58.15 |=====================================