it should be so fast and work with very weak devices
Jobima zfast G.slangp
shaders = "4"
feedback_pass = "0"
shader0 = "shaders_slang/crt/shaders/guest/hd/stock.slang"
alias0 = ""
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
filter_linear0 = "false"
float_framebuffer0 = "false"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/crt/shaders/crt-resswitch-glitch-koko.slang"
alias1 = ""
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
float_framebuffer1 = "false"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/blurs/shaders/gaussian_blur_filtering/gaussian_horizontal-sharp.slang"
alias2 = ""
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
filter_linear2 = "false"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "source"
scale_x2 = "2.000000"
scale_type_y2 = "source"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/zfast_crt/zfast_crt_finemask.slang"
alias3 = ""
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
filter_linear3 = "true"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "viewport"
scale_x3 = "1.000000"
scale_type_y3 = "viewport"
scale_y3 = "1.000000"
gbf_SIGMA_H = "1.250000"
gbf_HSHARP0 = "1.400000"
gbf_HSHAR = "0.000000"
gbf_HAR = "0.000000"
LOWLUMSCAN = "4.000000"
HILUMSCAN = "1.000000"
BRIGHTBOOST = "1.000000"
MASK_DARK = "0.100000"
MASK_FADE = "0.950000"
or download it within “All-in-1 Jobima Presets V1.251” or newer