ALT+TAB is very slow

[entorri]

working several weeks for applications development using MATE
my bug report is a performance one regarding ALT+TAB switching which is VERY slow.

Here goes my kernel live config just in case. it shouldn't be SELinu but it clould be the X multitasker preloading perhaps?


kernel.nmi_watchdog = 1
kernel.unknown_nmi_panic = 0
kernel.panic_on_unrecovered_nmi = 0
kernel.panic_on_io_nmi = 0
kernel.kstack_depth_to_print = 12
kernel.io_delay_type = 1
kernel.randomize_va_space = 2
kernel.acpi_video_flags = 0
kernel.hung_task_panic = 0
kernel.hung_task_check_count = 4194304
kernel.hung_task_timeout_secs = 120
kernel.hung_task_warnings = 10
kernel.compat-log = 1
kernel.max_lock_depth = 1024
kernel.poweroff_cmd = /sbin/poweroff
kernel.keys.maxkeys = 200
kernel.keys.maxbytes = 20000
kernel.keys.root_maxkeys = 200
kernel.keys.root_maxbytes = 20000
kernel.keys.gc_delay = 300
kernel.perf_event_paranoid = 1
kernel.perf_event_mlock_kb = 516
kernel.perf_event_max_sample_rate = 100000
kernel.blk_iopoll = 1
kernel.yama.protected_sticky_symlinks = 1
kernel.yama.protected_nonaccess_hardlinks = 1
kernel.yama.ptrace_scope = 1
kernel.osrelease = 3.2.0-23-generic
kernel.version = #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012
kernel.shmmax = 33554432
kernel.shmall = 2097152
kernel.shmmni = 4096
kernel.shm_rmid_forced = 0
kernel.msgmax = 8192
kernel.msgmni = 3986
kernel.msgmnb = 16384
kernel.sem = 250 32000 32 128
kernel.auto_msgmni = 1
kernel.sched_domain.cpu0.domain0.min_interval = 1
kernel.sched_domain.cpu0.domain0.max_interval = 2
kernel.sched_domain.cpu0.domain0.busy_idx = 0
kernel.sched_domain.cpu0.domain0.idle_idx = 0
kernel.sched_domain.cpu0.domain0.newidle_idx = 0
kernel.sched_domain.cpu0.domain0.wake_idx = 0
kernel.sched_domain.cpu0.domain0.forkexec_idx = 0
kernel.sched_domain.cpu0.domain0.busy_factor = 64
kernel.sched_domain.cpu0.domain0.imbalance_pct = 110
kernel.sched_domain.cpu0.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu0.domain0.flags = 687
kernel.sched_domain.cpu0.domain0.name = SIBLING
kernel.sched_domain.cpu1.domain0.min_interval = 1
kernel.sched_domain.cpu1.domain0.max_interval = 2
kernel.sched_domain.cpu1.domain0.busy_idx = 0
kernel.sched_domain.cpu1.domain0.idle_idx = 0
kernel.sched_domain.cpu1.domain0.newidle_idx = 0
kernel.sched_domain.cpu1.domain0.wake_idx = 0
kernel.sched_domain.cpu1.domain0.forkexec_idx = 0
kernel.sched_domain.cpu1.domain0.busy_factor = 64
kernel.sched_domain.cpu1.domain0.imbalance_pct = 110
kernel.sched_domain.cpu1.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu1.domain0.flags = 687

[jsc]

I had the same issue running Mint 15 Mate, after turning on "Use compositing" option inside the Desktop Settings Gui. If I turn it off, ALT+TAB runs much faster than before, without lag.

Menu->Preferences->Desktop Settings->Windows->Performance->Use compositing (off)

I don't know how to do this from command line.

Good luck.

[michael_1234]

I had the same issue running Mint 15 Mate, after turning on "Use compositing" option inside the Desktop Settings Gui. If I turn it off, ALT+TAB runs much faster than before, without lag.
Menu->Preferences->Desktop Settings->Windows->Performance->Use compositing (off)

After merely checking "disable thumbnails in alt-tab" in the same gui config made my alt-tab reasonably fast again, while still leaving compositing enabled (...which I think is required for e.g. docky, which I also use.)

Apologies for belated reply,
-Michael